I’m sorry. Some people just suck! Don’t let it get to you. I’ve learnt to let people’s reactions to my stutter be a reflection of who they are and NOT me. You did something brave and you should be proud of yourself for stepping out. Just a suggestion: for your next interview maybe let them know of your stutter. I did that with my last interview and it helped me get through it with ease. Don’t be afraid to take steps that will make you comfortable in settings like that.