If Person B is an empathetic, objective, self-aware person (i.e. not a Creepy Guy), they're of course not going to do that, They'll figure out that Person A is acting uncomfortable, for whatever reason, and dial back on the interaction as opposed to trying again and again in the same way. Perhaps they'll try a different "tack" if they feel that engaging with Person A is that important to them, but they'll still be way more careful about it than they otherwise would. Simply because it's the sensible, rational thing to do at that point.
As for Person A, the sensible thing to do would be to walk away from the whole thing well before they even get a chance to be made contemptful or disdainful. If they're unable to do even that then, well, there are ways you can call Person B a creeper to their face in a quite polite, respectful, and even plausibly-deniable way (i.e. Person B gets to save face!) and Person A should probably resort to them. That alone would be enough to break the vicious cycle of contempt.
Quite simply, the symmetry you're pointing at here just doesn't exist - being creeped out by someone is not the same as being a creeper yourself! Not even close.
