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In dates or other social situations:

• treating service staff badly
• talking about themselves to exclusion of all other topics
• ordering for you without your input
• acting as if they're doing you a favour by dating you.
• quotes anything from incel, MGTOW, or other manosphere sources
  • especially Joe Rogan
• freeze peach fanatic
• uses words like "woke" or any of the other alt-right bugaboos without ironic intent
• acts like the word "feminist" is a dirty word
• uses racial slurs
• "Asian women are my fetish" (yes, I've had people—plural—use that with me)
• volunteers religious identity without it being the topic of discussion
• toxic negativity
• toxic positivity
• doesn't read
• doesn't listen to music
• has no opinions that aren't slogans

... and a cast of thousands ...

Wow. I've built up quite the suit of armour over the years.

Red Flags (if I don't blatantly show disgust, I'll probably ghost you after observing this stuff):

• Littering
• Treating animals like objects
• Treating staff in restaurants and shops etc. like trash
• Being into manosphere shit or treating any podcaster / influencer / asshat with a microphone like they're a guru
• Interest in conspiracy theories and/or 'free speech' aka actions without consequences
• Crying about wokeness or women or queer people

Amber Flags (I'm a bit put off but I don't want to judge a book by its cover so I'll get to know you first):

• Subscribing to a religion
• Having no neck, a red face, short / no hair, tribal tattoos and walking like you've got an invisible water bottle under each arm
• Being a constant 'positivity' person

Edit: I feel like that's a lot. Maybe I just hate everyone lol. Maybe I'm the red flag.

Mocks others, gets angry at jokes about them.

They pour the milk before the cereal.

An adult that often doesn't accept when they're wrong, glosses over it or shifts the blame. Yes, it's part of growing up but past a certain age it's a terrible sign in someone.

Unnecessary aggression or assholery.

Kisses their dog on the lips, but does not french the cat.

Fatal, depending on point and depth of penetration.

I don't specifically have any. I just trust my feelings and am open and honest as possible.

They don't listen to music at home.

They accept a lack of evidence as natural in vetting someone for their supposed wrongfulness.