My pet peeve: MEN WHO WEAR BASEBALL CAPS IN UPSCALE/MIDSCALE RESTAURANTS!!! I tend to find that many of these men are either rubes or bald guys embarrassed to show their heads. Baseball caps MUST come off when dining, or I will knock it off (that is if said person isn't built like a tank).
Just in Restaurants???
I hate guys who wear a baseball cap everywhere (especially white guys who wear it backwards).
Hiking and when I have to go out for a short bit to do/get something before I had a chance to shower and that's it for me. I would never go to any restaurant fancier than McDonalds, nor would I even go to the dankest dive bar wearing a baseball cap. I gave that up when I was 12