Is AUTHOR wrong in the post ? POST : Right away this sounds like I'm just looking for sympathy, but I'm honestly conflicted. I'm usually the type to stay out of other people's personal lives unless asked otherwise. 

Anyways, I'm a junior in high school, and my friend is a freshman. She's a nice girl in general tho rather immature at times and the adopted sister of one of my best friends since I was small. She was in the foster system for most of her life and has had a lot of emotional trauma. Anyways, I bowl for my high school team and so does her boyfriend, whom I've known for many years. Before we bowled in high school together, though, we bowled in a Thursday league together. This is where it gets a bit messy.

In leagues, he bowled for the team that teased and bullied me both behind my back and to my face for a good five years if not longer. Insults ranged from calling me garbage to just calling me a bad bowler. It didn't bother me too much, but I always had high self esteem when I was younger. I had been away from him (and his team) for two years between when I started high school bowling and he started, since he is also two years younger than me. 

A couple of weeks ago I had to interact with him as a high schooler for the first time. He berated me for my sexuality (which had been told to him by one of the girls on the team) and made fun of my boyfriend and my bowling. I also found out he was making fun of me behind my back, predominantly about the fact that I tripped and twisted my ankle while I was bowling (I'm quite clumsy). Again, it doesn't bother me much. Teenage boys or stupid.

The next week my friend tells me she's dating him. I don't say much at first, but eventually tell her all the things he (and his friend, who she also spends time with, and was also on the team that made a lot of fun of me). I expected her to be understanding. Instead she screams at me, telling me I don't understand him and just because he says some things doesn't mean he's bad. She also tells me to grow up. 

Quite frankly I'm confused but feel terrible. AITA?

tl;dr my emotionally messed up friend is dating someone who bullied me as a child and is mad at me for telling her he might not be right for her.