If someone is snapping their fingers at waitstaff, shouting down a customer service rep, or abusing a stranger—they're an a-hole—absolutely no question about it; by acting in this way, they have broadcast their character loud and clear to the rest of us. But not all a-holes are quite so blatant; some do an incredible job of disguising themselves as a well-meaning person—a wolf in sheep's clothing—if you will. These people can go undetected for long periods of time, only exposing themselves in s…