Puma Store in Aterbury Value Mart

So today at the #puma store in Atterburry value mart I was denied entry into the store and was told that I need to lock away my bmw backpack whilst watching all the female customers walking in with their big handbags. Upon asking to see the store manager I found myself face to face with this extremely rude guy that insisted that there is a difference between a backpack and a handbag. I asked him repeatedly what the difference is between a handbag and a backpack and he bluntly refused to answer me. I pointed out in the store how the ladies were allowed to shop bags over their shoulders and he couldn't answer me. I asked again and again and made no progress. I feel that I have been discriminated against as I have no issues if they check my bag upon entry and exit. But why do I have to check in my bag in a locker but the handbags are allowed through. I asked that he provide a name and employee id and sign, which he bluntly refused. The staff is very rude and blatantly discriminating