Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: So I want to give this some context, I [M21] have a girlfriend [F20] and her best friend [F20] who are all really pretty close. Now this friend of my girlfriend's is very open to lots of experiences. For example, her and my girlfriend had a threesome and she also is very hypersexual. Anyways, she decided one day to get her nipples pierced, and she sent me photos of them to show them off, which isnt super weird considering the threesome background.

Anyways, over the weekend my girlfriend and her friend were at their place and my girlfriends brother [M15] was hanging out with them. The girls drank a little bit and the next day I was told by my girlfriend that the brother saw her piercings poking through her shirt and asked about it, to which she responded by flashing her tits to her. My girlfriend didnt seem to think it was a big deal that her own brother saw that, but when I heard about it, I voiced a different opinion.

I told her that it was not ok to flash a 15 year old boy, especially because in my state, the age of consent is 16. Even if he was 16, it would still be weird and not ok to me considering it's her friends little brother. I was not expecting her response, to where she said I was being sexist because guys can show their tits so girls should be allowed to as well. She says equality of rights. I fully support womens rights, but tits on a female are secondary sex organs, but not on a male.

Does this make me sexist? AITA for making a fuss about it, especially considering nobody else is batting an eye?

being sexist