Lots of reasons
1. Bad apples
Furries are notorious for being full of perverts and degeneracy. Im not talking about a person who spanks it to StarFox, Im talking about really crazy shit. Zoophilia is very common and was far more accepted before the cancel culture started. Pedophilia is very common in the fandom. There are tons of very weird fetishes floating around. The "I like to fuck cartoon animals" is basically PG rated in the furry community compared to shit that is popular like vore/gore/diapers/everything in the furry art freakshow thread. You have people like Zaush deliberately flooding the #Zootopia tag with porn when he knows it has a significant number of children viewing the hashtag. You have general lolcows like all the grifters, tons of trannys, shit loads of drama and virtue signalling. The fandom is heavily infested with liberalism and the ones on the right side of the isle are just as degenerate and retarded as the ones on the left. The Rainfurrest incident is an example of the kinds of shit that give furries a bad name. Tons of self-proclaimed "representatives" of the fandom tell the public that its only a small minority of people who sexualize furries but in reality its more like 80%. People aren't stupid and they know the vast majority of furries have a sexual interest in the fandom and it grosses then out because A) its zoophilia-adjacent B) tons of trannies / fetishists and C) children are attracted to furries because its full of giant cartoon animals.
2. Cringe
This just speaks for itself. Try watching a furry make political hot takes while in a fursuit. Take a look at all the horrendous shit on Tik-Tok(to be fair to furries, 95% of Tik Tok is cringe garbage anyway). Its nerdy and weird and unnatural. Watching a person acting like a cartoon animal in a suit is like watching your 60 year old father do Fort Night dances. In naturally triggers the impulse of "this kid needs to be bullied for the betterment of society" that normal people have. It also doesn't help that virtually all furries are incredibly socially awkward and autistic.
3. Annoying
Since 90% of furries are faggots, they have picked up all the bad habits of the LGBT-alphabet cult. Pretentiousness, playing the victim for pity points, "fursecution", and the insatiable desire to shove their shit in everyone's face and demand people accept them. It used to be furfags would just spank it to their favorite talking animal in private or with other furries in their private circles. Now people have to "come out" as furry and demand to be accepted like their some oppressed minority. People already find this annoying with other groups and furries are second only to trannies in being the most self-centered, egotistical attention whores in the world.
4. Trannies
Ive mentioned this already, but it needs to be said again. Trannies are the worst species of subhuman that exist and furries are infested with them. I actually have sympathy for furries with how much their fandom is ruined by gender niggers.
None of this is going to matter soon because furries are being infested by normies at an alarming rate and soon the fandom will be accepted. The fringe elements will be pushed to the sidelines and globohomo will absorb it. The OG furries will be infuriated and alienated and will likely just give up all together or start something adjacent but even crazier like trans-species nonsense or something. Normies sterilize and neuter(ironic choice of word) everything and are adept at ruining anything they touch. Have fun when a 45 year old Karen dresses up in fox ears and a tail and complains about Zootopia 3 on Facebook.
I don't hate furries, they provide me with genuine entertainment. Anime avatars on the other hand are a genuine cancer with nothing to add to society and should be exterminated, for real, not just in Minecraft.
And you're right, there are much weirder things out there than being a furry.
