Family Dollar complaint: Concerning face mask

I ask the cashier why he or any other employee never wear a mask and a customer behind me which had no mask on either said I should not ask this young man why he doesn’t wear a mask because its the government and so on and I told that man I wasn’t speaking to him then the employee told me he had the right to refuse service and he told me to leave the store. So I was made to leave the store just because I ask why they do not wear a mask when you have a sign on the door saying you must wear mask to enter! I was furious. I spend about 50 to 60 dollars a week at this location. Needless to say I will NEVER return to that store. There are dollar stores on every corner so I can spend my money elsewhere. These employees are no better than criminals on the street. They are taking a chance everyday they don’t wear a mask to infect their own customers and possibly kill them!