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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. 
yeah I think marble or bronze busts in the room are a pretty good clue
also if they have large sections of non-fiction leather bound books that could be a tip off, see the top 10 bestsellers here for example
I have a room full of old vintage leather bound books because
Uhhh
yeah I mean I wouldn't build a 'Chud-o-Meter 3000' around this because some people are collectors or want to be well rounded, but companies that print these usually choose from the western canon, so no radical stuff allowed, I have a few general history books bound in that classic style but nothing left-leaning except for the Eric Hobsbawm Modern History series.
I'm more thinking of people who show them off in the background as part of their online persona like some right wing commentators
It's not about the content of the books for me. It's about the smell
"The Art of War" is an express pass to Chudland.
Sun Tzu: 'Have a plan instead of sending your whole army to die for no reason'
Chuds:
Hey now, the Art of War is great and everyone should read it. Most people have never really sat down and thunk about the whens whys and hows of getting 50,000 of your buddies together to slaughter those shitass wankers in Wu and it shows.
It's still sus as some deliberate "look at me look at me" bookshelf display. It's up there with Infinite Jest when it comes to douche mating signals.
: (
Should...
Should I take down my signed first edition copy?
I dunno. Is there other stuff up there in the lawyer foyer that draw more attention?
Where is your time travel device and why are you here of all times?
Well yeah I've got Clausewitz, Machiavelli, Marcus Aurelius...
Oh no...
Oh no!