The second this turns into a flame thread, it's closed.
As for my opinion, it's kind of shifty. There are different kind of girls. I'd never outright attack a girl, but if they attacked me - that's a different story. Of course, it varies on the situation. I'm more likely to hit back if they are using a weapon of some sort, and even more likely if this girl were tough - like a tomboy or an athlete. On the flip-side, I wouldn't hit back if they were frail or unarmed.