It makes me wonder how people seem to deem furries to be the bane of existance

I mean, why not just like all kinds of women? At least that's some of the most common porno results you will find. Why limit to just Latino women or black women? I just find it weird you'd have whole web sites devoted to just porn with Latino/black women. Whatever happened to the rest of the beautiful women? Choices here, people.

Why are there website devoted to gay porn? Why not all types of human beings. Choices here, people.

I see fetishes as someone's not free will, if that makes sense. Some people class homosexuality as a fetish.

My views on the ones you listed:

Fisting
Huge turn off. Mainly because I only watch gay porn, so the fisting here might be a lot different to straight porn. In gay porn they have to proper lube their arm up, usually wearing thick black leather gloves, and yeah.
Poop
This is just wrong, imo. It happened in this porn once (apparently I was on a scat site, but I don't remember it being that, but yeah). They guys were sucking, and one put his ass on the other's face, i thought he just wanted rimming, but he just shat on him. I nearly threw up x_x
Vomit
Well, I throw up when I see/hear someone being sick, so this is a huge no-no
Watersports (not Omorashi. Watersports mean peeng on others)
This can be hot if done right. If the guys (gay porn, remember), drink a LOT of water, so their pee is transparent, it can be hot.
BDSM
In small moderations (tying up, domination), this can be hot. But when it gets to full-body leather suits, whipping until they bleed, it gets wrong.
Stuffing god knows what into where the sun don't shine
Dildos in porn? Hot.
Sex with inanimate objects other than sex toys, like... PLUSHIES
Quite a turn off. I saw someone fucking dough once. It was ew.
Black/Latino/etc exclusive porn
I personally don't find anyone other than Whites/Oriental to be sexually attractive, so this is a no-no to me.
Necrophilia
Not needed.
Formicophilia (bugs on/in the genitals)
I have a HUGE phobia of bugs, so yeah |:
Robot fetishism (you wanna get laid with... Bender?!)
Just, ew.