I once got shat on for saying I reduce my typical tip of 25%+ down to 15% for waiters who were particularly bad at interactions, in a thread where a bunch of waiters were patting themselves on the back for forcing bad-but-fast interactions that allowed them to give the appearance of service.
Such as avoiding eye contact, ignoring gestures from a distance, and leaving a table fast to give them as little time as possible to put in follow-up requests, or waiting until someone’s mouth was full or with a glass up so they couldn’t elaborate, and some other stuff I don’t care to remember.