Great question! I don't go to cons or meet up with furries IRL--I used to want to, but they don't seem fun and cool enough to appeal to me--so I wouldn't know.  FAs would like to think it's like a BDSM munch: "by and large, furries are bi and large" but reality doesn't closely follow that adage.  I would like to believe there are plenty of thin gay guys--without the fandom, I would not have ended up on /cuteboys/ and found males I could actually cum to.  I know for a fact there isn't the culture of thin-shaming that there is in mombie circles--the fatties are typically neckbeards, not vegetables in beetus-scooters.    And, of course, there are amazing dancers like Rinn.   In a fursuit, you work up a lot of heat.  Fatties could never pull off something like fursuit dancing.