Aibu not to want my partner to grope my breasts?

[Onlyconnect]

It's what he calls a 'comedy grope' which he does quite often when we are having a cuddle or just when he's passing me. I don't like it and have told him so many times over the 16 years we've been together. He has basically ignored me. Yesterday it came to a head when he did it again and I once more said I didn't like it. To illustrate what I meant I stroked his forehead and hair which is something he told me he didn't like years ago when we started seeing each other. I have never done it since till yesterday. He says it's entirely different as the groping he does is part of intimacy. Just to be clear it's not foreplay, it's fully clothed, could be in the kitchen or in the car or anywhere but not when other people are around. AIBU to put my foot down and tell him not to do it or should I just grit my teeth and put up with it?

YANBU - this is disrespectful and controlling behaviour. Agree with pp's that you need to ask why he feels the need to continue when he knows how you feel. Perhaps frame it like that as a direct question to him? Tell him it seems clear he just doesn't care about your feelings and is that really his intention?
Smacking him in the dick might be my gut reaction but I'd personally try to avoid it as it's just taking things down to his level.