Don't know why but this description I found in an urban dictionary reminded me of someone?
Little Hitler
A little hitler is a self-important tosspot who thinks he's in charge. Someone who makes up arbitrary and/or self-serving rules and has a tantrum if they aren't obeyed. They tend to have a park-keeper/traffic-warden mentality; rules are Law and rules come first. They can't handle people who threaten their authority.