Back in WotLK, I joined up with a raiding guild with my bear. My mic had been messed up, so the first two nights I was unable to speak in vent, but I was able to listen and we had zero problems because of it. I had a new headset by the next week's raids, but I still kept silent in vent because I had no need to speak. A few weeks in, I asked for clarification on one of the fights, and that's when the raid realized I was not a dude like they had assumed. Immediately the raid leader goes on about it, and demands pics before I was to get any loot. When I declined (because I mean, come on... seriously?) I was booted for "causing drama."
Worked out fine in the end, because that guild wasn't the place for me anyway. I'd much rather get in and do some actual raiding than listen to "hurr hurr bewbs" in vent. I am now at home in a much better raiding team, in a guild that does not allow any sort of favoritism harassment based on gender. Guilds that don't allow women to join them are fine, if that's what they want more power to them. Just like if a guild only wants people with purple hair, that's their decision.