This should be a "challenge" (if those are still a thing), to be performed by anybody who believes that the issue doesn't exist. Create a female account for some online game and see how much fun you will be allowed to have with it.
FWIW I made a female character on FFXIV (partly to see if this sort of thing would happen) and never encountered this. Maybe I put out a male vibe with how I move and play (I heard we jump around a lot more). But in my experience that game's populace skews far more heavily female than normal, and a lot of the guys I met also play as female characters so maybe that's why.