That's absolutely awful. I'm sorry they are doing this to you. I have had a stutter my whole life (37) and I've never received treatment like that, not even in the military. I'm pretty sure its illegal for them to even make this an issue. We have the Americans with disabilities act as well to protect against this kind of discrimination. If it were me, I would be out of there since they're not worth my time if I'm being treated like that. We're not dumb, we have a speech impediment. I hope all works out for you in the end :)