There are plenty of exposed waiter etiquette faux pas that are posted online. Like this pretty major restaurant receipt fiasco, which is apparently a sore spot for both customers and waiters alike.
If you ask me, there's no reason to not tip a waiter who's satisfactorily providing you with service.
In fact, is there anything less attractive than someone who is mean to a waiter? It just deflates your libido, doesn't it?