I hope I can explain this! Like many people I'm friendly with lots of different people, that I met and built relationships with in different situations. However because I live in a smallish community, and kids are all school age, there's a lot of overlap of friendship 'groups' if you can call them that. We've been trying make an effort to get together for a night out occasionally and different people can make it at different times.
My next door neighbour K is very popular, gets on with everyone, a great friend. She's very close friends with A, who is not quite so popular and in fact gets on a lot of people's nerves. I have known A a long time (longer than most), and I see what people mean but she is basically quite vulnerable and insecure, and has a lot of problems in her life, really more than average. I think her behaviour (which to me, never gets beyond a bit irritating, she's not malicious) all stems from that.
Recently, 2 other friends approached me to ask if next time we go out, K would go if A wasn't invited (I suppose because she's my neighbour?). They want her on her own. I was shocked tbh and sort of spluttered 'you'd have to ask her' but I really wish I'd said 'I don't know, but I won't!'. To me, that's bullying by exclusion and I want no part in it. Plus how can you 'invite' or otherwise to a couple of drinks at the local bar? Different if it was someone's house, although I'd also be uncomfortable if that happened & I knew about it.
Anyone got any pearls of wisdom? My strategy right now is do nothing, say nothing. I now feel slightly uncomfortable around these 2 friends though, which I'm sad about as I previously thought they were really genuine.