I would have asked her what makes her think “I am a racist”?..”Why did she say that?”, I would make her defend herself (her comments..) but that’s just me.
Just
“BZZZZT, you lose. Obviously you don’t have the intellectual capacity to argue your point of view, or you wouldn’t resort to name calling, specifically pulling the race card.”
I would recommend the following reply:
“Madam, please. Litigious slander is so unbecoming to civil discourse. May I have your name and your lawyer’s name and address?”
It's the same as asking.......”Exactly when did you stop beating your wife”.
You can deny that you never stopped because you never started, but then comes the followup questions.....
I have decided that is they ever do it to me, I will say nothing and just punch the A-hole in the nose. I know that will lead to a arrest and charges, but I don't know how else to gain control of the soap box.
The end result is always going to be violence if they continue with this tactic, and I might note that the store shelves are completely sold out of Ammo........