Are all black customer allowed to skip the queue?

I went into Pick & pay Centurion mall to buy a chocolate, and I stood in the queue to pay and behind me 2 black gentleman walk right thru queue and they were helped by the cashier first? As soon as I questioned as to why they being helped first, the black lady @ the till had something to say and the two blacks guys were helped first. I am not a ****** so why should others be to me? p.s I left the chocolate and walked out. Will now need to support other retail stores and cut away from pick & pay.