Shakey's Pizza review: unethical behavior of manager towards their employees

I heard the whole conversation of a resigning employees and his manager. The manager was a guy and he was wearing a glasses. The employees were all girls and this manager is talking to them as if he is not outside and no one can hear him. So unprofessional and disappointing. He is blabbering and that poor girls were crying already. Please take this in action. I believe that the action taken by the manager was so unprofessional to think that he is a "manager", regardless of the situation. He has no right to shame someone in front of other people. I also heard the manager said that those girls are working students, how unprofessional and unethical those words were to those students. I have a few minutes of voice message of the conversation they had but I won't upload it since it'll also be unprofessional for me. Do some action on this. Thank you.