I hate everything about LLM and generative algorithms, but as someone who spends years talking to himself only, allow me to answer:

Where are their friends and families?

My family is here with me, they barely tolerate me and if I had a choice I would be far away from them.
Friends, I have none. I go out from time to time with some people I know but they tolerate me because they have a use for me, not because they are thrilled to be with me.

Are they so bad at socialising that they can't meet new people?

Yes

Are they just disgusting human beings that no one wants to associate with because society failed them?

I don't know if society failed me or if I'm just a neural mistake, something that was allowed to live but shouldn't, all I know is that I hate humans in general and if I had the balls to do it I would not be alive anymore.