riahon:
For all you know she was professional, but she DID take offense, remained professional, went home and cried because she is trying her best and someone twice implied she was stupid in a crowded restaurant and she considered ending it all again.............just like when she was bullied at school.......
Quiet an assumption. The op already explained that his comments were made in a humorous way. A normal waitress would not have taken offence to this at all. Far worse things happen in the daily life of a waitress. (customers that shout/swear when food is wrong/late etc, yes that happens all too often in the industry).
It seems you are suggesting people need to walk on eggshells around the average waitress just in-case they having a bad day, they may take offence? You forget though, they are there to serve, and the customer is always right. (Thats their job!)
If said waitress did take offence then maybe she should look for a job in another industry. Waitressing is definitely not a job for the easily offended.