I hate it when someone approaches me to play out a smut thread between our characters but then they have their character play hard to get to a degree that completely stretches credulity.

Did you want to thread out smut or not asshole? Or are you trying to maneuver my character into raping yours even though that would be wildly OOC?

The same thing applies for ships; I hate when someone suggests we ship our characters and I expect this is going to be a mutual thing developing between the characters but they neglect to mention that what they really want to play out is some one-sided bullshit where my character moons after theirs forever and never gets anywhere.