Interesting thread. Lots of people with mayo dislikes, but it's one of the most common condiments.
I grew up eating Miracle Whip because we couldn't afford anything else. Sandwiches need something, whether it's mayo, Miracle Whip, oil or meat drippings. Dry sandwiches are like eating sand.
Hot dogs - mustard, ketchup, onions, relish. That's a good dog.
Potato salad - Mustard FTW! Mayo potato salad is gross. Macaroni salad is the work of the devil.