I kicked a trans persons ass.
Why are you so transphobic?
I found him with my younger sister.
Let your sister choose her own friends, even if they are different from the ones you want her to have. Beating up somebody for being your sister's friend is wrong. If you do this your sister will not want you around anymore.
I'm sorry but it is way too disturbing for me to accept.
It's a good thing your sister doesn't need your approval to make the friends of her choice. You can't just go around beating people up because you don't like something about them. The world would be an extremely violent place if everyone did that.