I Have a Question

Run to positively.

Reject it and move away from it as soon as possible.

Get on my bike and find an other bar

Depends on where it comes from. In most cases I avoid it though

Ignore.

Go inside myself

Leave it if you can. If 'stuck' take a deep breath, recognize it for what it is, make the conscious decision that the negativity is what "they" are about, it isn't you, not what you are about and NOT WHO YOU ARE! In essence, removing yourself from it mentally and giving your self permission to be joyful and happy around a bunch of depressing idiots. Warning though, if done effectively it can really warp your sense of humor in some ways.