What, if anything, causes you to INSTANTLY say "nope" to someone you previously had considered dating/getting to know?

Posterboy56
For me it's finding out that she has a kid (s) or that she smokes. Or that she's stupid/votes Republican or something.
What, if anything, causes you to INSTANTLY say nope to someone you previously had considered dating/getting to know?
What about yours?
What, if anything, causes you to INSTANTLY say "nope" to someone you previously had considered dating/getting to know?
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