Discrimination is not a useful issue before UC hearing.
The general view is if you submit resignation and they accept it "early" then you just resigned=NO UC!
In some far fewer cases, if your resignation was well worded (which I sort of doubt) it is possible to make the point that they fired me before my resignation took effect and therefore the nature of thier terminaton is the determining factor and if they terminated me w/o cause I should be entitled to U/C !
Yes, if Whites always got paid final weeks and Blacks always got no pay and exited that sure smell like discrimination--but that issue needs to go before EEOC process --much more complex process.
Now if company smells a stinky discrimination problem they might be wise to not contest your UC any further ...