Had dinner in Thai restaurant in Atlanta.

Poor table for two , I chalked off to busy period, after all was there to eat good food.

The Thai waitress ignored us for a time, finally took the order without paying attention to request for one mild and one very hot. Delivered it luke warm. Request for extra hot sauce (standard fare at all Thai)was ignored , delivered almost at the end.

Paid the check, NO TIP. Owner /manager chased us saying we forgot to tip, said no we remembered not to tip for the lousy service !

Seems those with the "proper 20 % tip" crowd who may be trying to assuage their "guilt" do spoil these servers into expecting 20 no matter what.