The Grabbing thing, wasn't very nice too watch, but to me it looked more like a custom that a girl would show her interest in a potential Husband but would resist the lad getting too strong to show she isn't a dirt bird. I could be wrong but I think it's maybe not as bad as what it actually looked, in that both the Girl and the Lad knew what they were doing.
In saying that, If I had a daughter and some f*cking Letch was mauling her like that, I'd end up slinging digs about. In fact if I seen any of my sons acting that way towards a girl I'd slap the sh!t out of them as well.