>But saying anything at all that blames someone for not yelling No at the pest is a problem

This is the exact type of black-and-white thinking I find so exhausting arguing with. Nothing is an absolute, there is always a scope for suggestions on how something can be done differently.

Just to reiterate my point, a "Nah, not tonight" should be just taken as a "no" by someone thinking rationally, but it has the potential to not be by guys who are in denial. They can reason it out with themselves that "maybe she really meant some other time works fine" - I've seen people do it first hand.

I understand there are other reasons to not be direct, which makes sense to an extent, which is why I'm suggesting the alternative of being indirect and then not spending more time with the person.

If after the initial "No, not tonight", the guy asks to hang out again the next day, the girl should just not. If the guy really got her message, he wouldn't be asking to hang out so soon after anyway.