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Anime avatars are often a coin toss between (potential) comrade and chud, so it may be fun and maybe helpful to think about and share those in the place of that old 
bellwether for chuddery.
Mine is anyone with ".eth" as a suffix in their online name. I have yet to see a single person that does that that isn't a chud. 
It may even be cheating, but seeing an actual cryptofascist cartoon "original NFT do not steal" is a pretty reliable red flag too. 
EDIT: Oh yeah, I almost forgot. 
You're right. If someone puts "hates furries" up front in any way, I've yet to see them not be a chud.
The last person I knew who hated furries, I actually had a good conversation with him about it. Convinced him it was a shitty and reactionary take
If you actually changed their mind, you may have found a unicorn. 🦄
I like to think I did. We haven't really spoken in a while (no real reason)