AITA for offending my sisters friends by suggesting they shouldn't get changed in the same room as us?

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The original was posted on /r/AmItheAsshole by /u/aitasister611 on 2023-06-26 14:05:41+00:00.

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My (39f) sister(32f) had a birthday get together recently and brought together a group of girls for a day at the beach, I'd say I knew about half the girls there before hand. We all had a great time and all the girls seemed pretty nice.

However after the swim we went into a public changing room next to the beach for changing into dry clothing. The only issue was 2 of the girls were trying to enter with everyone else, lets call them M and N. They're both gay and openly in a relationship, which I don't have an issue with, but it definitely is a little uncomfortable undressing in front of them.

I know they wouldn't have tried anything, but I have a lot of guy friends I knew wouldn't try anything either that I still wouldn't want to get undressed in front of.

With this in mind I asked them to wait outside the changing room before everyone else got changed. M and N got offended and started calling me all sorts of things. Stuff about how ignorant I am, with most of the girls taking their sides. Eventually it all calmed down but later on my sister told me how annoyed she was at me "insulting" her friends.