In terms of conflicts you hate, I don't like it when you manufacture a conflict just for the sake of drama.
It happens a lot in romance plots/sub-plots, for example
MC: I'm going to choose side characters plan/method instead of love interests
Later Love interest is either jealous or begins questioning how MC feels about them
and now that is going to be the sub-plot/character motivation for this episode of love antics (added points if side character is actually another potential love interest)
Or a none romantic example
Side character: Why is MC acting so suspicious, instead of asking them about what they're doing I'm just going to secretly investigate/stalk them
Or they ask and the character is just being vague for no reason
But like with anything if it's written well enough (and/or for comedy) I'd still forgive it