Not allowed to try on white clothing

Rustenburg Mall-I was at Pick n Pay clothing in the mall and wanted to fit some clothing items. However I was not allowed into the fitting rooms with the white items-if I wanted to fit anything it had to be a coloured item only. There is a reason why a person chooses a specific item in size and colour to fit! It's ludicrous as the shop is filled with white clothes and it's not only white items that can get soiled when fitting!