okay it's just. almost everyone hates on cameron at some point or another.
foreman tells her she's afraid of commitment and doesn't know what love is. he 'jokes' that chase needs to treat her well because she'll be so unbearable if she's heartbroken, and later 'jokes' that if chase isn't careful he'll be stuck with her forever; he similarly makes fun of cameron's crush on house. there's the article theft thing, which... isn't quite as bad as cameron makes it out to be (he didn't steal her article), but still a rude thing to do to a friend or colleague and at the very least shows a lack of concern/regard for her.
cuddy complains she's "not nearly as delightful as she thinks she is," and both cuddy and wilson have feuds with her in s1-3.
amber in whatever it takes, the second time they've ever spoken, says that "everyone" finds cameron "so annoying," which taub doesn't correct or refute.
thirteen spends most of their shared scenes in living the dream rolling her eyes at everything cameron says.
house... oh boy, house. is he a bit obsessed with her? absolutely. is he attracted to her? definitely. is he remotely kind to her...? not all that often! he tells her her feelings are bad and fake and she's a selfish person on their date. he regularly calls her annoying or makes fun of her. he bets with foreman about her HIV test, and doesn't show the slightest concern or care: he laughs at her for her care in euphoria and uses her as a mockable example in three stories. he openly delights in proving cameron wrong. and sure, house is Like That, he's Mean Because He Cares, whatever. remember how she was crashing out and he made fun of her for it? what do you mean, which time? sure, he can also be kind to her, treats her differently than others, but he also very frequently makes a point of belittling cameron or tearing her down. (compare cuddy, who he also, of course, mocks -- but will drop it to avoid crossing certain lines, or will sometimes do something very sincere. he also doesn't regularly imply cuddy's deep seeded issues or health problems are mockable.)
people! do not! like cameron! it isn't even only this: nurses gossip about her and tell patients about her (one day one room); patients often don't like her all that much, for that matter. and cameron can definitely be prickly and judgmental and even mean: she gives as good as she gets. (let's discuss how much of her punchy attitude is in direct response to cameron knowing people don't like her and will dismiss her simply for being a woman with opinions: she says as much in control.)
but you know who does like cameron?
chase is the only one of the original cast to never make fun of cameron's husband. not even once. he's a bit jealous of the guy, but he tells cameron it was a "perfect relationship," not -- as foreman and house do -- that it was a fake one that didn't count.
chase is the only one to show concern for cameron and check up on her in hunting. he doesn't participate in the HIV test results bet. in euphoria, when foreman tries to infect cameron, chase is absolutely pissed at foreman the rest of the episode.
chase does tease her a little about her crush on house... but not as much as foreman. and he actually gives her good (or, what he thinks is good) advice on that front, both when she confides in him about it, and before the date. he also teases her less than foreman after the date.
in general, while chase does sometimes tease or poke fun at cameron -- spin is a great example -- it tends to be pretty light. he very rarely rolls his eyes at her (ie, in skin deep, when she tells him off for being flippant). he never complains about her being "unbearable" or "annoying" or accuses her of being unable to love, having never been in love. that isn't to say he's universally 100% sweetness and light where she is concerned: chase can be sarcastic and dismissive for sure. but he's not mean.
in fact, chase only ever gets upset with or unkind to cameron three times. first, in heavy, in a moment that is fully intended to be out of character/to show how desperate he is: chase throws her under the bus to keep his job. the second, in lockdown, when... you know... he's a bit hurt about the divorce. and even then, he drops it almost immediately. the last is saviors, where he dumps her and is justifiably angry with her after she ghosts him... and he still happily proposes and takes her back once she's cleared the air. (he is upset at her -- kind of -- in a few other episodes, but in act your age, the itch, under my skin -- he's still very clear about understanding her issues and wanting to give her time, or wanting to reassure her.)
chase! likes! cameron! he is nice to cameron! he worries about her! he checks up on her! he doesn't mock her and her issues or roll his eyes whenever she speaks or jokingly call her annoying! is he the Perfect Guy? hellllll no. he laughs along at other jokes; he calls her "easy" in human error. but it's. it's not a contest. it's not even close.
and people wonder why she picked him. people wonder why she keeps going to him. it couldn't possibly be because chase is the only person on the show that doesn't think cameron is ridiculous for caring.