Wrong. About 13-14 seconds into vid he does something to make her rapidly react. Probably touched her butt or something. And I don't have much respect for girls who hang out in bars. Still, it doesn't mean guys are entitled to touch or harass them. And who knows if she regularly hangs out in bars anyway. I sure don't.
The drunk woman took offense at him trying to squeeze past and in a alcohol induced rage started screaming at him, raised her right fist to hit him, kicked him (or kneed him, it's hard to tell) and then tried to clock him with a left hook.
Initially only trying to defensively stop this crazy drunk lady from attacking him, he finally had enough (after being kicked [maybe in the nuts] and then almost getting left hooked . Proceeded to retaliate with one quick punch and then retreated to escape the situation.
Probably...
I don't care about your assumptions.
I'm curious about the biases that drive them though, Want to share?
She is reacting to him already at 0:07.
She turns her head over her right shoulder and looks at him.
He appears to be staring at the ‘large empty spot’ at the bar - the Red Bull mat.
But his approach is blocked by another woman, on left.
We cannot see his hands at this time.
In fact, going back to 0:06, his approach is not on the woman he hit, but to the other woman on the left who is blocking the approach to the empty bar spot.