I don't think Tsubasa's friend is too wrong. Kaede did "push" his trauma on her, but Tsubasa wanted to know what clearly happened after she realized she probably misunderstood him the first time around. She could have kept it vague and kept the misunderstanding going and while it would have sucked for Kaede, it wouldn't have shocked him so much (but it probably would have made it more difficult for him to keep healing.)
Tsubasa was the one who felt repulsed by Kaede. She is the one who got her innocent and really naive world view shattered, but that was going to happen at some point anyway and above all, "Was it really done against your will? 1You are a guy, so was it really that difficult to go against her-"... for just those two lines, she deserves to be smacked. If his bros knew she said that... Sure, he could have done something against it, but it's similar to being mugged. Some people retaliate and can get away, some people just give the robber what they want. You can't fault someone for being mugged and tell them, "Well, why didn't you jiu jitsu them to the ground?" While a robber will threaten the victim with violence and the teacher didn't quite do that, the fear is the same.
And she has the gall to say, "He was the one who pushed me away". Maybe she thought with time they could have worked it out and it might have actually worked, but it would have been really difficult and also quite painful for Kaede. And you can't expect someone to stay with you, when they know you feel repulsed by them. No one with some amount of self-worth or pride would do that. I do understand that some people feel so badly about themselves, that they would keep the relationship going anyway, but most wouldn't.