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.
Especially when it's "men and feeemales" or shit like that.
Half the time it's used in a dehumanizing like you said, the other half it's mimicking cop language "Perp is a 5'9 caucasian female on foot" Either way
Perp is a 6'10 green furred troll-like creature
Perp has layers, like an onion
Perp is a complex multi-faceted person, who cannot really be described by human words
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Rarer but still identifiable there.