I'm going to refuse a promotion at a fast food restaurant when asked
Why do you want to refuse the promotion?
I want a better career for myself in the future.
It might not be the career that you want but it is not good to refuse a raise. You can at least have a higher income and more money in your pocket if you change careers later on.
I feel like my coworkers do not respect me.
Maybe they will respect you more as you move up. This can be a stepping stone into a new career for yourself, you should take the promotion.