Fandoms are usually pretty similar in behavior, so it's easy to draw similarities between most large fandoms.
I think there's especially a lot of similarities between these two, though, in particular. Based in large part around aesthetic sensibilities. Being seen as little more than an excuse to look at perverse erotica, and that every fan is a sexual deviant. Chock full of social rejects and desperately needy folks who bring up their stuff in inappropriate places and at inappropriate times bringing derision of the fandom as a whole. Fascination with something a bit alien to their existent cultural norms, and an attraction to the foreign and "deviant".
(Note: In the minds of many folks still, and especially in past years, anime was practically defined by hentai, though they generally dealt with accusations of pedophilia instead of beastality)
The only real difference between them is that the anime fandom as a whole (in large part guided by the anime
industry, I'd wager) finally managed to seize a hold of their image and rehabilitate their appearance a bit, and distance themselves from their worst element. Basically, anime successfully managed to go mainstream. Other than that, they're practically identical. It wouldn't exactly be a stretch of the imagination to see furry having taken control of their message and anime instead becoming the kicking bag of the internet - most of the slurs and disgust with either are pretty interchangeable.
If bodily modification is crucial to someone's psychological stability, then alright. If it's for fun and games and we're not in a utopia, I'll be further irritated.
Well, I'm glad your irritation has no control over me then, because I'm a huge fan of body modification.