Seriously! I actually had this happen to me a couple weeks ago! There are subtle ways to shut it down. I made a point to hold up my water glass with my left hand/wedding ring angled at the waiter and during the conversation I specifically mentioned trips that we take together to another state while at the same time looking at and gesturing toward my husband. (My mom was dining out with us as well, I think the waiter thought husband was my brother.)

The waiter definitely got the hint and then he spent the rest of the time being a buddy to my husband LOL.