I feel like most places have those people... some guests are just difficult... but to suggest that someone shouldnt be allowed to come in because Youre unhappy about your tip is incredibly unfair. Lots of restaurants dont make it. Lots of GOOD ones... the greater good is served by people buying food... hopefully they tip well, and if Shes that good im sure they usually do. But ask to ban them rubs me the wrong way. When the staff starts to feel entitled rather than grateful it (imho) sets a dangerous precedent