Embarrasment is your own state of mind. You stutter,... so what... I do to. When you are in the situation that you are stuttering in a conversation and you are feeling that the situation is becoming somewhat 'cringe' : Just take a pause, tell them casually that you stutter, maybe a quick sorry towards the customer. You will be surprised how postitive people will react. And as a side-effect your stutter wil likely decrease. Good luck. You got this ! Ok once in a while there will be an A-hole, but there is a reason we call people A-holes. :-)