As I said in another thread, it's not that uncommon for women to grab ass. Certainly, men are responsible for more unwanted groping than women, but it's not such a great idea to use this as an excuse to beat up on men for being so awful.
We agree that it's not uncommon, but it
is awful. This is what feminists mean when they talk about rape culture. It is ingrained in our culture that there is a spectrum of vaguely acceptable nonconsensual sexual violations and a toxic belief system around that. It needs to stop.