Your gracious smile is wiped off your mouth when Brett barks at you:
"Is that what you think I am? Just some half-wit waitress? I happen to be a first-class architect, y'know! For your information I'm just helping the owner by standing in for the regular hired help. Furthermore, yada-yada-yada, etc., etc."
Touchy! Some people are too sensitive. You slink off the bar stool in defeat, but not before scooping up your coins and shoving them back in your pocket.