I have two children, Bryce(18m) and Raine(15f) (fake names). I always taught my kids to be respectful to one another. Sure, there were the fights you'd expect from siblings, but nothing too serious, or so I though.

I've been noticing that Bryce has been acting very mean towards his sister. I'm not sure when it started exactly, but I remember one day when Raine came to me upset because Bryce made comments about her acne, which she was very insecure about. I told him to stop and he told me "it was just a joke". He kept making comments that were upsetting Raine, and no matter what or my husband do, he wouldn't stop. We tried EVERYTHING for the last year. Grounding him, taking off priviledges, trying to talk to him, but he'd keep doing it.

I remember once when Raine was upset because she got a C on a certain subject. She's a great student, but she was having dificulties with this subject and was very upset. When Bryce found out, he said "Oh i knew pretty girls are dimb, but i though the ugly ones were at least smart." We got pissed and scolded him and once again he said it was just a joke. He was grounded for a week.

Now for the current issue.

A few days ago, maybe two weeks, Raine came out as asexual. We were supportive because we just want our kids to be happy. I won't lie and say I understand everything about LGBT, but she explained it to us and everything's was fine until now. I noticed her pride flag sticker that she have made and glued to her door had been ripped out. I asked her what was wrong, and she told me what her brother did. She told me she was talking to her friend on the phone when she mention the fact she's asexual. Her brother probably listened and barged in hher room and started yelling at her, telling her to stop making everything about her sexuality (hasn't been doing that after she came out) and to stop bothering everyone with it (she was in her own room). Then, he told her that she wasn't asexual, and was just creating excuses because no one wanted to f**k her. I was livid. I went to his room and yelled at him, that I was done with his behaviour, that we tried everything we could but he wouldn't stop being an asshole. I told him that I almost ended my life because of bullying when I was younger and asked if he wanted his sister to do the same because of him. He looked pale. I grounded him again for the rest of the month and told him that if his attitude dosen't change, I'd kick him out. He blew up at me and said I was being unfair. We fought more and I left his room. Now he's giving me the cold shoulder. My husband said he understand why I said that, but I think I might have gone too far. So, AITA?