Your behavior has become a employee safety liability. Your behaviors are impulsive and unpredictable, and place your coworkers and customers in possible danger of being verbally accosted and, now, racially attacked. They will not pass you and the accompanying possible problems and liability on to another store in the franchise. When you used that racial insult, you landed in realm of racial harassment which can fall under much heavier legal penalties if something continues to go on like this. They won’t mess with that kind of thing.

Seek therapy to work on consistently changing your behaviors - not just for show for employers, but in a lasting and transformative way. Without those real and lasting changes in your ability to cope and behave, you will continue to fall into this pattern and remain unemployable.