I've hosted six FT dos, some of them as big as 60 people, and have met hundreds of other FTers one-on-one or in other groups. I don't think anyone I've met in real life has ever been rude. Socially retarded, unable to hold their liquor, boundary issues, pathological liars, and plain annoying, yes. But never rude.
The vast majority are great people, and I have made some wonderful friends. There were four FTers at my wedding.