Okay, let me put it this way.
If you were in a restaurant, minding your own business, and a couple of adults, or children, at a table close to yours, started smearing food over each other's faces. Would most people be ok with that?
Or would it be said that it's disturbing, tacky, and rude to people who had to witness it?
Would we think it's cute, loving and lighthearted? Or would we ask to be seated far away from them? Maybe we would even hope that these people were asked to leave, because we didn't want to be forced to witness such a display.
Then why would it be ok at weddings?