They inadvertently burnt our food, but very quickly replaced it. While waiting, the cashier (Karen) started making sarcastic remarks. When asked to add to my order, she huffed and puffed, and then became outright rude and started rolling her eyes when I pointed out she overcharged me. As the manager fixed Karen's mistake, Karen became more and more confrontational! To the point the manager asked her to leave..but she REFUSED to move. She was asked again..in which Karen took two small steps and just stood there. She refused to leave until the manager (Peyton) said Please. Yes. When Peyton left to fix the order, Karen said she didn't care and none of it mattered to her.I thanked Peyton for being gracious, and told her it was unfortunate that Karen disrepected her and conducted herself this way in front of customers.