If you felt this much judgement just from the interview, either you are panicking and read their reactions wrong (happens! We are hypercritical of ourselves and assume that others are as well) or you dodged a bullet. You don’t want to work somewhere where you feel the need to apologize for your stutter. It will most likely leave you feeling worse about yourself and no job is worth your mental health. These people made you feel bad about yourself, and you shouldn’t beat yourself up further for reacting to their rudeness. Hope everything works out for you. You’ve got this and don’t forget be proud of everything you’ve accomplished. Interviews are difficult and you did well by doing your best!