Sometimes, people like to go to bars to hang out with their friends or significant others. Believe it or not, entering a bar does not give you the right to run around groping people.
The sexual assault apology in this thread is unbelievable.
Hitting on != groping people and you damn well know it.
How to handle actual harassment and assault is obvious: you call the fucking cops. I'm not sure why that warrants a discussion at all.