HAHAHA, no dude, Not run and cry, So what if a tiny (yea rof your size) chick hits you. It's not like she's gonna give you any damage :D It's all about attitude. And from your post it appears that the girls know this. You say some hit you slap you and smile cos they know you aint' gonna do nothin'. And yet she maybe expects you to react by a physical manner. But you're smarter AND better than that. What you need to do is answer with the same attitude. Take the 'hit' ..hahhaa... and no matter the circumstances, just grin. GRIN like a f-in pathetic fly landed on your shoulder or like a mosquito bit you on the cheek. It's all about that attitude, So the answer is No, don't hit a girl. Show her with your expression and mimics, wordless that what she did and the deed itself is worthless. A respectful lady wouldnt do such a thing.