Being groped as a woman just isn't the same as a woman grabbing a man.
I was once restrainedl and fondled by a lifeguard in a pool. He was much larger, stronger and older than I was. It was extremely frightening even with other people nearby.
That is just not the same as the slutty girl who works the cash register grabbing my son's behind while he is working the grill. Inappropriate, disgusting, sinful, awkward etc....yes it is but it is not frightening or threatening.
The level of vulnerability is not comparable.