I'm gonna try my best to be peaceful here, I don't intend to start shit, but I don't really see how any of this helps Thalia's case, nor do I see how it makes the main ship any better?
If Varkas in fact did try to force himself on Thalia, then how is that going to convince readers that they are just a tragic, messy, but ultimately a wholesome and loving couple at the end of the day? If the intention of Kim Suji is that they are both horrible for each other, then it's at least a little more understandable, but if they're supposed to be rooted for as a couple, this whole "Well he was going to rape her back so they're even." Isn't exactly a gotcha moment, it's just solidifying that they're a toxic pairing.
I will admit that I was contributing to the racist Thalia theory mostly for shits and giggles since racism is so normalized (and in some cases, even glamourized) in many east asian comics, but the theory didn't come out of nowhere just to shame her for being an imperfect victim of abuse.
First of all, racism and xenophobia aren't limited to white people attacking people of color. White people can be, and have been throughout history, prejudiced to other white people simply because they aren't from the same country and/or continent.
Second of all, you can still say something racist or make racist jokes even if you don't actually believe that certain people aren't human because of their skin color. Racism is unfortunately very normalized in some way almost everywhere you go, to the point where most people don't even realize that they are being racist in their day to day lives, especially if they come from a privileged background.
Thalia may not have any canon racist beliefs, but what she said was still messed up.