Honestly it’s petty but his voice and mannerisms are probably the reason I just can’t stand the guy.
If by mannerisms you mean spending more time on the court than his players then I agree. He's like a hyperactive dad coaching his sons 5th grade team.
I get that coaches yell instruction during games but I can't think of another one where it's as constant as him...non freaking stop on both sides of the floor. It's just annoying as hell.