ACME Markets review: service by manager

This morning at seven fifteen I went to shop. The acme store was to open at seven am. I went in through the out door. All employees enter this door until front door unlocked. After I finished shopping the manager told me not to enter the out door as I can break the door. She was quite serious and inappropriately angry. The store opens at seven am maybe three out of seven days. This behavior was inappropriate and consistent with the obvious that customers are second class citizens.