Two wrongs don't make a right.
SPOILERS.
When Minny put a bit of her s*** into Hilly's pie - that scene wasn't funny at all. It's clear that Hilly is a racist, she's hardcore and extremely harsh and black women couldn't cuss her back or anything like that, but two wrongs don't make a right, Minny lowered herself to Hilly's level pulling a stunt like that, there was no need for it because she was no longer working for Hilly and didn't have any plans to return, Hilly wouldn't be able to verbally abuse her and humiliate her anymore, Minny was free of Hilly, so why go back? Just to get your revenge? And was you satisfied? No she wasn't - as we see clearly in her facial expression that it was wrong and she even admitted that she asked God to forgive her.
As a black British person i say take the high road and let the racists make fools of themselves. You reap what you sow. You don't have to do anything, let their wrong ways come back to them.