I (F32) was told to “stfu” by fiancé (M35) in front of his dad today is that repairable?

Is this really bad or does it happen? My fiancé and I were doing spring setup on our rooftop for the summer and putting up a shade sail, and his dad had to come help. My fiancé does very poorly under stress and he was getting heated due to the shade sail not working. He was being verbally edgy with his dad and I was like chill out he’s trying to answer your question but you keep interrupting him. To which he replied shut the **** up and added my name at the end. I feel really upset by this. And embarrassed. Does this sort of thing happen every now and then or should I be concerned by this sort of thing?