"Angry doctor"

I came to the doctors because i had an appointment. I went to the desk told them my name and the receptionist said it will be 1/2 hour. I thought good i have enough time to pop to target as it wasn't far away. I came back and i sat down. The Dr came out and called me in. 

The doctor was red in the face sitting back in their chair telling me they walked up and down the hallway looking for me, when you book in you stay here. I was told by reception they would be half hour. The Dr was sooo angry. There was no need for it.  I asked if the Dr would ever apologize but they keep laughing and saying they dont remember or who me.  I cant seem to shake it because why.