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. 
The comment section when you insult Applebees
Golden Corral VIP list
You cracked the code.
Obviously you cant always judge a book by its cover but there are signs and redflags and sometimes even airhorns.
Look at all those
s
Further proof wh*te people were created by Yakub in a lab.
Legend has it Yakub was highly insecure (another trait he passed on), and tried to overcompensate for his wide head by giving his creations flat, thumb-like skulls.
Anthropologists claim this is the first recorded instance of "looksmaxxing".
What was the sad day where a goatee stopped being a sign of dashing-villain hotness and started being the sign of someone who enjoys going out for microwaved soft food?