Off colour

We had a little problem with a semi-regular gentlemen customer at a popular destination in the town centre. We see him in passing most weekends, see him in most months and see him like this very rarely.
He seems to have some inherent communication issues, though not severe enough to stop him having a small group of consistent friends. He has socialised with this group for several years and he appears a core member of it through the numerable cast changes. He does however have some issues and these are exacerbated by drink.
He doesn't seem to read group dynamics, he can't seem to see who's associated with whom and where the lines of familiarity are drawn.
He will interrupt conversations to put his unrelated interjection over the top of it. He will be overtly friendly with groups of strangers who just happen to be unlucky enough to be walking down the street at the same time he is. These might line him up for some abuse and intimidation but these are all strangers and generally used to dealing politely with the socially inept you encounter on a night. What his most troubling issue is when he is angered or confronted by one person he can transfer this anger onto another group or person who haven't been involved.
He often gets into arguments, on the street and inside venues but is normally sober enough, or more accurately not too drunk, to let these accelerate. He backs down, his friends wade in or we guide him away. He's not particularly aggressive, he's not large or intimidating, he just gets baffled by group dynamics and boundaries.
When he's had a skinful however, he doesn't know when to back down, he doesn't know when he's in danger, he doesn't seem to clock when his mates are not around.
All of this adds up to us finding ourselves dragging him out and landing him on the street. We don't bar him as this only happens once a year, he and his group are normally a fun, big spending group which reflect the target audience of the venue well. Some folk just shouldn't celebrate their birthdays it seems.