Sometimes you have to just let it out. I don't begrudge a person their anger, as long as they don't curse themselves for stuttering. It's no crime to stutter. I've encountered some who think I'm rude because I stutter. It's as if they should not have to go through it. And my response should be that they do not have an ear handicap: I'm the one with the stutter and I have the right of way. They only have to wait an extra 2 to 5 minutes, or less than that. So no way a bully should make me feel guilty for stuttering and taking an extra minute for phrasing things. Alls that they have to do is not be an idiot over the stuttering: If it's difficult for them to not be an idiot, that is their own fault. There are books on how to deal with toxic people, so the entire world is dealing with the same bullies.. but the bully may be using a different excuse with them. If you can cut them off, then great. Maybe ask for a supervisor. Or say well that was rude and look them in the eye. If the adrenaline starts going a little, there could be some extra fluency. Of course, sometimes things can go badly and just moving on to the next person quickly may be a better thing to do. At one point, I would tell people to go stand outside of the room for a few minutes if the stuttering is so bothersome to them or they can't control their laughter (maybe lecture them for one or two minutes before moving on). They never would actually leave the room: However, sometimes others in the room would take over and make them leave for a few minutes when they loose their temper. So you should try different things. Who knows how it could go, and others in the room may be offended too (and brave enough to speak out). OKay, I may be rambling on. But I hope there's something helpful in this post.