The manager I guess, old british man with grey hai...

The manager I guess, old british man with grey hair treated an employee very badly in front of all the costumers and also told me to move from the chair / table saying I could not be near to the tablets. I was having my meal and NO ONE was there using the tablets for the shopping. I was beside.
Never treat your colleagues in a rude way and specially in front of the costumers. the colleague was trying to help on the self check out scans