And that other rent-paying person has no issue with the apartmate’s level of dress. In fact she has expressed anger at OP’s comments according to him. I was not insinuating you to be sexist, just saying that this prudish manner of thinking perpetuates sexism. I think what we need to look it is WHY is OP feeling awkward and WHY are about half the folks in this thread saying it’s okay for OP to try to impose his ideas of modesty and respect on two people in their own home.

You haven’t mentioned this, but this is a respect issue. Respect is not about catering to the person who is more traditional or conservative (not in the political way). OP doesn’t respect his girlfriend or her apartmate in this situation, but it’s not malicious. She is not disrespecting OP by behaving as she sees fit in her own home. OP is disrespecting her by complaining about something that he doesn’t realize is actually not his choice or about him at all.

He feels at home there because he’s there a lot, which makes sense. So he also thinks he has a right to feel his version of comfortable there, which also makes sense. He just doesn’t realize that his version of comfortable clashes with BOTH of the rent-payers’ versions. And in that case, he is free to not be there if seeing a person in their underpants is really that much of an issue for him.

I don’t think he’s an asshole, he just isn’t seeing it from any perspective but his own. But that’s how I feel about most posts on this sub.