Oof... as was I. I guess I'm late to the party. Lol
Oh, female zoos can definitely become targets for internet justice warriors, especially if they expose their identity and make it easy for them. But I think most of it comes from public perception of the sexes. Men that sleep with animals are seen as depraved, sadistic, desperate, rapists... while women that sleep with animals are usually just seen as "sluts." Of course I disagree with both of those notions, 100%... but unfortunately that's how it's perceived. That, and women tend to sleep with male animals, and it's easier to infer a base level of consent with male animals than it is with female animals. We all know Rover will hump your leg on his own if you let him, and some women just take it a few steps further and get on all 4s for them. There's also the fact that people still treat women as a class of people that need "protection" from the world. So even if they're caught doing something "naughty" they're less likely to have the proverbial hot coals raked over them for it.
Whereas with men, especially men that sleep with female animals, are generally seen as depraved rapists by non-zoos. Hell, even by some other zoos themselves. Of course, *we* know that female animals can consent to sex just as women can consent to sex. But people's erroneous perception is that they cannot. People feel female animals are even more in need of protection than women. What's funny is that when it comes to zoos, homosexuality is actually QUITE prevalent among men. Ah, but anti-zoos don't need to know that. And men, in general, are seen as people that need less social protection than women.