psychological dickhead

Someone who makes a situation unnecessarily stressful or inconvenient in a manner that benefits nobody. Often includes usage of emotionally manipulative tactics such as gaslighting, moving the goalposts, and guilt-tripping.

P1: "If you don't buy this off me I'll burn it all."
P2: "What is the point of doing that? Just give it to me."
P1: "Nope, $600, take it or leave it."
P2: "Oh my god, you're such a psychological dickhead."