Zak: I worked fast food and it was really awful. I don’t know what restaurant you work at or what the rules would be, but one simple thing you could do would be to ask if you could move to a role where you deal with customers less so you wouldn’t have to deal with them calling you “ma’am” as much. For instance, I worked french fries and at McDonalds and I rarely had to interact with customers and actually barely had to deal with my coworkers either (granted they then moved me to the drive-through and that was pretty customer-heavy, but you get the point). If there’s anything like that you could do, I’d recommend it (cleaning the restaurant, doing dishes, working grill, etc.). I also tried to turn it into a game as much as I could to make it more entertaining and try to keep my mind off of the particularly obnoxious parts of the job. If you live in a bigger area you might also be able to look into being transferred to a nearby branch of the same restaurant so you’d work with different people, but that might not be feasible or even solve your problem.
If this is a temporary job for you or if you are saving up for something specific, remind yourself of those things. Hopefully things will improve.