So if someone tried to make the argument that an attractive guy can get away with behavior that would get an unattractive guy labeled a creep, I think my response might be along the lines of this (trigger warning):

"It sounds like you're saying 'It's so sad that sexy people get away with creepy behavior more often than unsexy people do! It's unfair that the hotter someone is, the more boundaries they can violate! Unattractive people have the right to be rapists too! You spoilsport; why won't you let ugly people have any rapey fun?' That's what I hear from your argument. Do you really want to advocate on the side of the creeps, rapists, and abusers?"