That was me basically when I was younger. I can't tell you how many waitressing and cocktail jobs I lost talking back. Minimum wage serving jobs are a dime a dozen, and from my first job to my last job in that industry I mostly got fired for not putting up with anyones shit.  There was a notorious fat couple that would come in, get tons of bread, share an appetizer, and I think a soda. So they'd run you around like crazy for a few dollars. I must have come over about 20 times "apologizing" for forgetting their bread, butter, and soda, and they were so so so so so pissed. Id bring them like a slice of bread every ten minutes, and walk by with mounds of shit for my good tipping tables. It was great.