I.... can't answer this normally so we have to make do like this @ladysunami .
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However, after a moment of contemplation, Jiang Cheng forced himself to reign in his hostility.
Although he was very unhappy, as the head of a clan, he had more to take in consideration than a young man like Jin Ling, and couldn't act upon impulses. With the decline of the Qinghe Nie Clan, among the three other major clans, the Lanling Jin Clan and the Gusu Lan Clan were already extremely close due to the close personal relationship between their clan leaders. He, independently leading the Yunmeng Jiang Clan, was in a relatively isolated position among the three. Hanguang-jun, Lan Wangji, was a highly respected figure to those who were cultivator's and his elder brother, Zewu-jun, Lan Xichen, was the head of the Gusu Lan Clan. The two brothers had always been harmonious, it was better to avoid such a public falling out and avoid breaking any ties.
Just as well, Jiang Cheng's sword "Sandu" and Lan Wangji's sword "Bichen" had never actually clashed, and the outcome of such a battle had yet to be seen. Although he possessed the family heirloom ring "Zidian," Lan Wangji's guqin "Wangji" is as also equally renowned. What Jiang Cheng could never tolerate the most was being at a disadvantage, and without absolute certainty of victory, he would not consider engaging Lan Wangji in combat.
Jiang Cheng slowly withdrew his hand that had been touching the ring. It seemed Lan Wangji had made up his mind to intervene in this matter, and it would not do for him to play the villain when it was no longer convenient. The matter would be set aside but he would remember it. Jiang Cheng weighed his options, then turned to see Jin Ling who was still covering his mouth indignantly, and said, "Since Hanguang-Jun intends to discipline you, accept his guidance this time, It's no easy feat for him to extend his authority over the youths of another's house."
His tone was mocking, and it was unclear just who he was mocking. Lan Wangji was never interested in verbal sparring and acted as if he hadn't heard. Jiang Cheng's words were laced and barbed, he spoke again, What are you standing there for? Waiting for the prey to stumble and run into your blade? If you can't get what lurks on Dafan Mountain today, don't bother coming to look for me again!"
Jin Ling shot a fierce glare at Wei Wuxian, but didn't dare to aim it at Lan Wangji, who had silenced him. He sheathed his sword, bowed to the two elders, and retreated with his bow. Lan Sizhui spoke, "Sect Leader Jiang, the Immortal-Binding Nets that were destroyed will be compensated in full by the Gusu Lan Clan."
Jiang Cheng sneered coldly, "No need!" He chose the opposite direction and strolled down the mountain. The guest disciples followed behind him silently, their faces pulled long with worry, knowing that they would inevitably face punishment upon their return.
So we'll start here regarding the context I will be extrapolating on for this:
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Here alone there are already three major words of emphasis æ-zuĂŹ- most, ç-dĂ really(major emphasis of declarations) ć°±æŻ- further emphasis of something being exactly and precisely stated. "What Jiang Cheng could never tolerate the most was being at a disadvantage,".
It has been established at his introduction that Jiang Cheng set up the nets as a cheat for Jin Ling. He is at the advantage of being able to do this as he has the power to do it without those below him having their dissent acknowledged and it affecting him.
He has the advantage to threaten a nameless (to him) and supposed mo dao cultivator (and it is later established he does torture and kill people he suspects, even when he is wrong, and is unquestioned (due to his status). Jiang Cheng did not expect Lan Wangi to interfere with his own morally crooked actions, as he ironically just told Jin Ling to kill those of crooked practices.
He is angered at his cheats being ruined by Lan Wangji, thusly categorizing himself exempt from moral duplicity. But he is very aware of the disadvantage he is now in, power-wise, as well as politically. He cannot blatantly dismiss Lan Wangji, nor can he outright attack Lan Wangji who is well respected by cultivators despite not being within the major political sphere and well liked by his brother who is one of Jiang Cheng's fellow leaders.
He cannot afford to isolate himself further as his tie to Lanling Jin is proxy of Jin Ling. Where he could kill and harrass a nameless mo dao user, he does not have that advantage when confronting Lan Wangji. Either aggressive avenue he pursues would be to his detriment, disrespectful at minimum to the entirety of the Lans if he continues mocking Lan Wangji, and seen as weak physically if he did fail in a battle losing any superfluous respect he holds amongst the sects and clans as one of its leaders. He does not have the pragmatic knowledge either to engage Lan Wangji in a battle to confidently say he can win without a doubt.
He can however continue to take it out on Jin Ling who he is blatantly mocking in stand in for Lan Wangji, and others below his status as his guest disciples dread repercussions from him for this interaction and none can choose to stand against him.
"Is the narrative implying Jiang Cheng would never fight someone where he was at the disadvantage", barring extraneous situation (one being when he is protecting Jin Ling from Nie Mingjue's power jockeyed with resentment corpse), yes. That has become his modus operandi ever since he chose to condemn Wei Wuxian as a power hungry traitor and agrees to his death for the power hungry Jin Guangshan out of resentment. We also see shades of this when he continued to tell Wei Wuxian to let Wen Chao parade and tried to stop him from protecting Mianmian. He does not pursue impulses that are to his major disadvantage and when they are failures as well as repercussions despite doing the right thing, he instead put the onus of blame on the victims.
"Choose your battles" is indeed the philosophy Jiang Cheng has in comparison to Yunmeng Jiang's "Attempt the impossible". Because where one can and does end in failure, his way is nihilistic but certain, especially in his continued path as a politically isolated leader. Is he necessarily cautious, no, he just understands who exactly he can condemn without repercussions to himself and he will not engage in battles that he cannot afford to lose face over.
He is not an altruistic individual, this extends to his actions and anything that is too altruistic for him, he has a lot of resentment for as he is put at a disadvantage for it. It's why him finally choosing to protect Jin Ling, who is at the biggest disadvantage by the end, is significant. He has not ever pursued something like that further in his life.