Wow, that sucks. Every time someone tells me to slow down and breathe I instantly hate them. If they mention my stutter being a disability I instantly hate them. Unless they have a stutter or are close with someone who does they have no right to say such things. That guy is about to lose a very valuable manager and he will regret it. Best of luck on getting out of there. Some people will never understand. I am lucky enough to work with a bunch of great people who could care less when I stutter and many of them get pretty upset when a customer badmouths me for my stutter. Only one person I work with seems to hate me because of my stutter. It's time to get out of that place, get a transfer even. Just get out of there while u can.