Car guard threatens to slit throat

On 03/04/2015 I went to West Park Superspar around 15h00 in the afternoon. I parked in the designated Eastern parking area. I left my vehicle and a car guard approached me. I asked him to not guard my vehicle as I am only going to be inside the store for a short period of time. He mumbled something that I couldn't hear. I ignored it and went inside the store. When I came out, the abovementioned car guard followed me to my vehicle. He screamed at me saying that I am white ******* and that white ******* is not allowed to shop there. He said that if I came there again, he would slit my throat.