Sonic Drive-In review: breakfast service

I went to the Sonic In Batesville Mississippi this morning 5/31/19 that opens at 6 AM. I was there at 6:50. I pressed the button to place my order and was told that they didn't serve breakfast until 7 by the employee who seemed to be in a very bad mood. I have been there before and ordered breakfast before 7. I don't understand why you would even be open in the morning if you were not going to sell breakfast. I simply said ok I'll go somewhere else that wants to sell breakfast.