Judging a book by its cover

Today I went into Clicks N1 City to buy a few items with my sister in law and husband. As we entered in the security became suspicious of us making us look like *******. When we were done purchasing the items we were stopped by the exit. They wanted to search my sister in law at the back which was very embarrassing. They started counting our items comparing it to the slip. I’m very unhappy. This is the first time I was treated like this. Never judge a book by its cover and that is what people tend to do a lot. Their customer service was very bad.