It could be done to wind you up, with little force, to get a reaction out of you, that would not be violent which is why context matters.I'm struggling to see any argument against VC. If someone grabs your nuts and squeezes it is done to cause you pain, how is that not in any way violent?
Add to that, these days it is also arguably going to be classed as sexual assault. Making unwanted contact with someone's genitals is the very definition of that.