My coworker corrected a customer who had been misgendering me unknowingly, lady apologized and was very nice about it. I hadn't had time to correct this woman previously. She was never malicious, is always happy with her drinks and speedy service (we start her drinks as soon as she walks in the door), always very thankful, so I wasn't like bothered by it or anything, but it meant a lot to me that my coworker took the reins and just did it for me.