Does Carl know anything about furries, and if so, why wouldn't he look into seeking them out? I'd think there would be a lot of furries out there who are gay and would love to meet Billy. *raises hand enthusiastically*
Carl understands the furry subculture/fandom about as much as any regular college student; he gets they exist but he doesn’t ‘get’ it. He doesn’t identify as a furry, and the fact that Dude called his werewolf alter-ego a fursuit freaks him out a little.
In an alternate timeline where Carl befriended furries in high school instead of a jackass-that-stomped-on-his-heart, he’d probably have a different world view. But then again, Carl wouldn’t have run into the fields and got attacked by a werewolf either.