There's a girl in my circle of friends (I can't exactly call her a friend) who does this. Often times she'll organize "couples only" events at her house - bbqs and other weird things that single people could easily do, but it's just for couples. So that means that me and my one other friend who's single in this group don't get invited. I literally asked her one day if she was trying to organize a swingers event or something because that's the ONLY reason I could imagine not being "allowed" to come if you're single.

This bitch moved away two weeks ago. Buh bye.