My hypothesis, based purely on personal experience and what friends have told me. I am not a furry.

I feel like infosec was one of the earliest "no one cares who you are if you have skills" user groups. Online, you were just a handle. Man, woman, both, neither, no one knew until if/when you met up IRL. Until then, all you had was your reputation. I think that led to people having a pretty good idea about the attitudes of people they were talking to online, staying away from people who were going to be jerks about identity or pastimes, and a lot of conversations like "General Mayhem is weird, but he's our weird, so no one mentions that fox tail he wears everywhere."

Over time, that was a positive feedback loop: people who weren't cookiecutter felt safer around infosec folks than most other crowds. => That increased the "weird density" of infosec meetups. => People who don't like being around uncommon appearance or behavior stayed away from infosec meetups. => Those meets became safer for uncommon folks. => Repeat.

I don't know if that's right, but again, that's what friends have expressed to me before. It seems plausible.

Note: When I say weird, I mean it affectionately. I've never met anyone in infosec who didn't have some quirk not far below the surface. Frankly, I love that. And because of that, and the virtuous circle I described, I've never had one single person in infosec confess to me that they weren't OK with gay or trans or furries or other type of behavior/identity/etc. I'm a straight white middle class dude, and unfortunately I have had people confess such things to me in other circles, mistakenly assuming that since I was in their demographic, I'd agree with them or at least be OK with it.