Wow. Finally. Something resembling some sort of actual discussion as opposed to troll posts. Thank you so much.
Anyway. That is not what I'm talking about.
In both cases I describe, there is supposed to be a sexual motive from the person performing the touching. You have decided to turn one case into a innocent attention grabbing action.
I'm talking about 2 people. One who grabs someone's arse and one who grabs a foot, both for sexually motivated reasons. Should it be considered abuse to touch a foot if it's sexual, or should it be considered abuse to touch a foot anytime, because it could be sexually motivated? (these are actual questions btw)
What if one day "tapping someone on their person somewhere" starts to get deemed a sexual thing? I'm sure there are people out there who would see any touching anywhere as a sexual thing, the sort of people who've never had a girl friend maybe.
Because bum, boob and groin are generally accepted as sexual for pretty much all people, feet not so much.
It's so simple, would you be happy with a stranger touching your gf/wife/mother/daughter in said area? No, then you probably shouldn't touch those areas either.