the UK is fairly notable in its tolerance of complete drunk culture, people staggering down the road and having fights, so while I have seen a few violent drunks in pubs, most have been dealt with by the bar staff, or ended up punching other random strangers, so I have luckily never really had too much trouble with them personally, just stupid drunks and drunks that think they are funny. I wouldn't go to a pub if I am not gigging, so I don't really have to deal with many of them, apart from the ones staggering home damaging things.