I don't recall the specifics, but I was in a flight, someone had stuck something in the seat pocket behind me, that was poking me in the back. I explained the problem. No response.
I reiterated the problem, more vocally. No response.
I jammed my elbow into the back of my seat, full force, dislodging something, and generating a notable, though incoherent, response, in the seat behind me.
No problems for the remainder of the flight.
Sometimes it helps to be 6'2", 240#+, and fairly compelling in person ;-)
Or, as I remarked to someone here a few weeks ago who'd noted that a "self described real asshole was actually a really good friend in person": Most of us who are real assholes have spent too much time polishing the skill to waste it on people or circumstances where it doesn't pay out.