Are you in what type of industry if you don’t mind me asking. Also don’t feel bad about something that wasn’t intentional. Stutter sometimes can be hard to control and you did your best. Also let me tell you a good advice I got from a family member. When you stutter and a grown adult refuse to understand your issue and give you some attitude, then the problem is not you. The person is trying to dump is personal issues into you so don’t feel bad at all.