Mine are....
Guys who don't hustle....get yourself in position cause if you are not where you should be, you are making us both look bad.
Guys who make up their own signals...Like the "superman" for their "over the back calls" rather than the push signal. Use the approved mechanics, that's what they want us to use.
The guy who who refuses to listen to anything you have to say cause he's patched/licensed or has more years of experience than you...I couldn't possibly understand anything cause I let my license lapse a couple years ago and I've been doing this for 7+ years!
Guys who take it all too personal ...If another official is advising you, just listen, don't take it personally. You don't have to agree or utilize what they are saying, but just listen....It might not be the way you do it, but that doesn't make it wrong and it doesn't mean you are doing it wrong either...