If you are part of any type of minority, female, black, etc, you can explore the discrimination angle.
Everyone is a member of at least three protected categories. We all have a gender; we all have a race; we all have a national origin. It takes far more than simply being a member of a so-called protected group to make a successful case for discrimination.
The matter in which your superior behaves toward you could be also be considered harassment.
Nothing the poster has provided suggests any illegal harassment.
What led the store manager to turn on you that way?
Irrelevant, without some actual evidence that it was for a reason prohibited by law. Which there is not.
have you tried HR?
The one point you make which has some vague relevance. It can't hurt to put HR on notice. However, since the poster has provided nothing to suggest that any law has been violated, HR is not obligated to take any action, although they may.
And before you get into the same "what can it hurt" arguments you've used before, just be aware that this is what I do for a living, and have for some 30+ years now. The respective state and Federal agencies that deal with discrimination are excessively overworked and underfunded. The more people who don't really have an claim of any kind but file one "just in case, because what can it hurt", the more resources are diverted away from those people who really do have discrimination or harassment claims.

