Instinctively, it raises my hackles, because positive discrimination is still discrimination, but I've seen it work really well in stand up comedy.
Women standups only events have a very different feel, but you are also more likely to see women do standup that is normally male territory. So you might see an angry female political shock comic, whereas mainstream female comics tend to do observational humor about life.
I'd suggest that there is value in creating a situation where vacuum causes people to fill roles they normally feel they don't fit the expectation for.