AITAH for calling my friend creepy after he admitted he showered with his sister until he was 18?
There’s a guy , Marcus (23M), in my friend group of four. He was originally a friend of one of my friends which is how we met. We're all 23—24. He has a sister who is two years younger than him. They’re very close in a way I’ve never really seen between siblings before, but I always assumed that not all sibling dynamics are the same.
Yesterday, we were talking about the fact that one of the other guys in the group has a crush on another friend’s older sister. That friend started joking about how disgusted he’d be because he doesn’t think his sister is attractive, and how traumatized he was after accidentally walking in on her changing once.
Then Marcus suddenly said, “I don’t get why people act like that’s such a huge deal. I’ve seen my sister naked tons of times.”
We were all shocked and immediately called it out. He explained that his household only had one shower, so he and his sister would shower together to 'save time.' At first, I assumed he meant when they were little kids, but then he said it continued until he graduated high school.
Based on the looks we were all giving each other, everyone thought it was weird, but I was the one who actually said it. I pointed out that there was really no reason for them to keep showering together as they got older. Showers only take a few minutes anyway, and even if time was an issue, he could have just gotten up earlier and showered first. He got very defensive and said they both preferred it that way because they were comfortable with each other, and their parents knew about it.
I thought he would drop it, but he kept arguing with us and acting like we were the weird ones for thinking it was strange. I told him that, as the older brother, his sister was probably just following his lead. He should have known to establish boundaries earlier, and the fact that he didn’t and kept it going for so long was very creepy.
At that point, he got upset, cursed me out, and stormed off. After he left, my friends told me they also thought it was creepy, but that it was harsh of me to say it directly to his face and that I took it too far.
AITAH for not keeping that thought to myself and confronting him about it?