Its hard to say. I play PFS in a game store and some AP home games. The crowd for both is mostly men (80% for the home games, probably closer to 90% for PFS).
Overt "no gurls allowed" stuff isn't common or tolerated, but interpersonal drama happens. People argue and fall out, feelings get hurt, sometimes people reconcile, sometimes they drop out. How much of that is just the perils of any large social activity and how much is gender tensions? Do John and Jane not get along because they're abrasive or because John secretly thinks women shouldn't be gaming? Does Jane think "John is mean because he's a jerk" or "John is mean because I'm a women?" Is she right? It's murky.
I think there has been significant progress. When I was younger my gaming groups were 100% male. Overt sexism is now unacceptable. Covert resentments and bias are harder to root out.