Sounds really like an immense burden. My heart goes out to you and u have my respect for the really hard job you do every day probably...
Yelling people, unfriendly people, my tinnitus, well... oh gosh... there are a lot of things I dislike, but I dont even care about most things then again anymore.
I am not afraid of people but it is so unnecessary to be an unfriendly motherfucker most times, I dunno why people are like that, even if I was totally weak and afraid of people I wouldnt behave in such a manor. That annoys me really in everyday-life, when people are just stupidly aggressive.