Manager and District Managers think they can act unprofessional and treat you like scum - Cashier/Cook Casey's Employee Review

There was nothing in the handbook about hair color. I got in trouble for having blue/green hair while my coworkers had bright red and even purple. The manager told me she couldn't do anything about it. Well, the next time I came in to work my shift, I was told if my hair wasn't changed then I would be suspended and possibly fired. Luckily I had already changed it. But the entire principal of her demanding me to change it and possibly firing me for something she legally could not control was absolutely absurd. Workplace discrimination. Also, one time I went into work 4 hours early to check the schedule to see who was off. I was being responsible looking for someone to cover my shift bc I was puking. Well, district manage was there and asked if I had a case of "Friday-itis." COMPLETELY unprofessional and rude. How do you expect your employees to be enjoyable while working if you treat them like garbage? So I found someone to cover for me. Well today, my manager called me asking if she needed to change the schedule for next week bc I "clearly can't handle 5 days a week plus school." I took the time to tell her I can handle it, I was just sick. I then proceeded to tell her I had a doctors note, she said "I WILL DO WHAT I HAVE TO DO THEN AND FIND SOMEONE TO WORK FOR YOU" and she hung up. Needless to say, as soon as I find a new job, I AM GONE. In an unprofessional manner, no notice. Treat me like garbage and expect the same response.