Constructive dismissal still is valid in at will states. Now sure, you would still have to prove that the horrible working conditions, including cutting hours, was do to being part of a protected class. BUT, the way that I understand it and what is possibly helpful in this situation, is that constructive dismissal, even if you quit, still counts as being fired so you can still pursue unemployment. A lot of companies pull this shit because they are trying to get you to quit without having to deal with unemployment. And you absolutely should pursue unemployment since there's a punitive measure against the company. The sad part is, with part time work (especially retail and in the food biz) it's easier to just go find another job :/ and I'm not sure how unemployement goes with part time work but it's worth looking up, especially if a worker feels they might be targeted for being part of a protected class INCLUDING if you've filed complaints against the company (I think this also includes internal official complaints) and you feel management is increasing bad working conditions for you in order to get retribution and make you quit.

r/legaladviceofftopic or even r/personalfinance might be more helpful if someone going through this wants to post and ask questions.