ill informed

I am a regular shopper at spar park rand. i visit spar almost every day weather it be for lunch supper or even my monthly shopping I was always a happy customer. on Saturday i walked in ordered food and as always i mean always i take a can of cold drink and drink it while i wait or do my shopping and never in the last 2 years was this an issue. as i opened the drink it spill-ed on the floor i take it was dropped or shacked before it was packed. the manager came up to me basically told me it was a ******** offence for me to open the drink and i felt that he is implying that i am *****ing but on different times different managers the teller would just show that i drank the drink and there was no problem. my point is am i a ******** now and the statement made was how can you use something before you pay for it. i normally eat in a restaurant before i pay i normally test a car before i buy so now it is a ******** offence is this because of my race you would jump straight to it being ********?? i am disgusted so every user that walks in spar is seen as a ********???? i am sick prove to me what law i feel this ******