Discriminating night shift petrol attendants

The night petrol attendants were so discriminating in fact I had to literally watch them attend to another car that just drove in while I was waiting where they told me to park. when I asked why would they do that they said where I was park was not easy to fill up what a lame excuse hence you told me to park there knowing my tank was on the other side. they purposely attend to the client who just came in because the client was driving a bigger car and the attendant said a word that he never knew I understood he said Uyakhlaya meaning I am crazy. I chose to ignore it and drove away. bad service I guess the attendants for the night shift need a bit of training on customer service.