The cultural fit in particular I like to use. This is often thrown around as a catch-all term by companies when they don't want to hire you for a bunch of bullshit reasons they don't want to disclose to you. It's only fair you weaponise too.

Had to use it recently to reject an offer and to avoid saying: "the person who would be my manager seemed like a gigantic dickhead and I barely made it the hour without slamming my monitor against the wall". Although part of me wish I had said that.