rude and thread

I was in Potchefstroom to buy cctv cameras and I was treated badly buy the white man who was selling them outside Game and I decided to go in Game to check if they are selling them and when I was in Game Potchefstroom I asked the employee of Game and he said they're not selling them and I said him if he knows anyone in Potchefstroom who is selling them and he said he is going the other black employee of Game and when he was asking him about what I wanted and he asked me why I don't buy from that man who is selling them outside and I was trying to explain what happened and the manager just started to be rude to me and he was telling me that I must go out of the his store and I told him that I was not talking to him and he started threatening me telling me that he'll throughout of he's store! I don't know I was wrong to tell the man who was asking me why I don't buy them from the man outside Game but what I sow it was because I was talking about a white man who was creating a black man bad and I write manager producing him and I didnt know that it's his store and I didn't know that in Game Potch we are not allowed to talk about the bad about white people who treat black man bad!