If you've ever worked as a barista, server, or bartender, you know that half of the job involves remembering regulars and making them feel special. To a jealous partner, typical barista banter can look like flirting, but 90 percent of the time it's just someone doing their job well.
Unless a barista is overtly hitting on your partner, it's best to assume their friendliness is coming from a place of innocence. Otherwise, you may end up looking both paranoid and controlling in a place of business.
"AITA for telling the barista that my girlfriend is with me?
Basically I'm 25m and she's 23F.
She gets company credit for food and drinks as she works for like a week at a time. She cooks all her own food and uses that money to buy a coffee each morning. She always goes to the same coffee shop."