I've never understood these retards who argue with the bouncers. You've been kicked out, get over it, and go away. You really think arguing with him is going to change his mind? I used to manage pubs/clubs, and it was the same thing every week.
This tool obviously deserved a slap, but the bouncer didn't need to get involved here. He's provoking the situation at the start of this vid, when he should have stayed on his door and let the police deal with this idiot.
Now if the tool did swing first, then it's a little different, but a quick slap to put him on the ground would suffice.