Family Dollar complaint: Discrimination and harassment

Family dollar has a security guard and he is locking customers inside of store. They have to ask him to allow them to exit, which is hazardous and unsafe for customers, which also seems illegal.
He is walking around with a gun and acting as if he is a cop, without knowing that as a security guard he cannot walk around, discriminating against any person, if they should choose to wear a mask. Family dollar has a no weapon policy, but does not have a no mask, policy. I was shopping for snacks for my pet and It was illegal for the security guard and the employee at this location to say that I had to leave because I look like I was a robber and had to pull my mask off or leave.
I had no weapons as the cameras will show, only wearing a mask, and they walked by me as I was shopping then came back and discriminated against me because I was wearing a mask, got verbally loud, and were screaming that I look like I was trying to rob the store and to get out. I constantly go inside this store, wearing a mask and the employees there at the location have never said anything until they have an armed security guard walking around. He ( the security guard ) stated that he is an employee of family dollar. I disputed this and told the guard that he was not an employee of family dollar and asked for the name of the security company in which he is employed but he declined to tell me. He kept saying to get out of his store. For wearing a mask and protecting myself from germs, employees from family dollar and a security guard, kicked me out, based on how I looked and dressed. Family dollar does not have a no mask policy, and it would be unethical to implement a policy such as this.
They verbally assaulted me and accused me, in front of customers of looking like someone that would rob the store. I intend to get a lawyer and sue, unless I receive an apology from the store location, and the crazy security guard removed. The store needs security, but not him. He may eventually shoot someone. He is locking customers inside and walking around, policing and throwing people out, when he doesn’t have that authority, nor does he have the authority to arrest. I want action taken immediately by family dollar or I intend to hire an attorney. I also want to know the name of the company, that the security guard is employed with.