This is a private enterprise. They can serve whomever they choose.
I doubt there are any men that “want” to be in this women only self defense class. There are lots of self defense class opportunities that are co-ed. Instead, I would be willing to bet, “the men” behind this are against guns and are a liberal bunch. Either that or they are perverts and predators. But maybe I repeat myself.
(I know very little about the issue. My opinion is conjecture only.)
Doesn't sound like this is true:
The city council will decide whether to allow men in the classes or cancel them.
This is govt-sanctioned discrimination.