I think it's more like a psychological behavior. Something she did and didn't realize. As Usagi loved Aoyagi much more than she did he was the first one to realize this.
Idk ik shes a fictional character, but I don't know if that's an excuse. Avoiding people with for ex disabilities just because it's "psychological behavior" that is not excusable
Usami also liked him and since they met, he hasn't felt any "psychological behavior" about it. Their other friends aswell too
I agree with you and I actually think she's a horrible person. It's clear since the first chapter she had a lot of prejudice against Aoyagi just because of his birth mark.
I was just talking about my thoughts about her specific way of sitting away from his birth mark. Usagi probably observed Aoyagi since much before (since he loves him) and that's why he realized his girlfriend's way of avoiding seeing his tattoo (by sitting away from it) when even herself hadn't realized this (this is what I meant in my previous comment).
I'm sorry if it seemed like I was creating a excuse for her
Well that's the point. She acknowledge she is terrible for it and tried to reflect on it. She thought about it and decided someone as good as him deserves way better. I think she is definitely a morally gray character, and it's fine. It's a realistic potrayal, and personally I think she deserves a second chance to do better cause she even call herself out at the end there..
She is gross no way she even sat in the other side bruh idk its literally like a tattoo theres no way it can make you THAT uncomfortable