Don't give up , my friend. I know it's hard, but we're made to fight!! God is reserving for you better offers because you deserve much more respect than these rude interviewers had given you. Don't let your stutter cover your intellect or your capacities . if I was to choose people who I want to work with , I would look into certain qualities and especially their behavior while they talk , are they nice and polite , do they listen , are they aggressive or too defensive in their talk and I would look into their abilities and knowledge and absolutely not their disabilities because they didn't choose to have that . The basic thing is to always make sure they get your ideas and your answers right , don't let them wondering if they got your point or not because we often forget that it is the message that matters not the way you transmit it .