Inequality in customer treatment

Yesterday on 15/10/2022 I walked in at Dischem Jabulani Mall to buy my son a juice. Got the juice and patiently waited on the Q until it was my turn to go pay. After the announcement was made that I should go to till 4 and pay, I went there, only to find that a certain gentleman wearing security uniform came from the front of the Q and paid ahead of me. The cashier allowed him to skip the Q and none of them bothered to explain to me until I voiced my dissatisfaction. Even after I voiced my unhappiness, none of the shop staff bothered to intervene and I ended up exchanging words with the customer who skipped the Q. The customer tried to threaten me and I stood my group and still nobody bothered to mediate. Only after the other customer had left the cashier tried to apologize about the incident and I politely told her that she must help me pay or I will leave without paying. I really felt offended, not sure whether it was because of the value of the goods I was purchasing that warranted the treatment or its just disrespect from Dischem. Whatever the reason was, the treatment was not good