Is the person in question just shy? Or is the person actually agressive towards other members?
I think it's quite acceptable for a player to turn up to band, play their heart out and then go home without socialising with anyone. It's nice if we can all be friends, but if a person does their fair share of work during rehersal and wants to keep to themselves, then the band should respect that.
If the person is offending other players by being arrogant, then it's fair to have a chat about his attitudes towards other band members. However, I bet if the person in question was a big name professional player then everyone will just keep their mouth shut. (so i guess my point is that in a perfect solution to the problem there needs to be a change in attitude from BOTH parties.)
Ted