I don’t know about that. Seems grossly disproportionate, some sort of professional disciplinary action would be more appropriate. Perhaps a fine he’d notice paying. It doesn’t seem like a sexual thing, just an excitement thing, I really don’t know whether you can pin in on sexism. Like, would I kiss a guy out of joy? Potentially yes, in this context, if I knew them well. Was it stupid? Also yes. If he squeezed her arse at the same time, I feel that would then be assault. But maybe not if you were to squeeze a guy’s arse in the same context? Also, if they were Italian I wonder if we’d be having this discussion.