Family Dollar complaint: Poor employee attitude

I have never made a complain in my life but this employee’s attitude was just really bad. I do not mind wearing a mask and I understand it’s required. I was taking care of a girl with a disability and took her to family dollar. I forgot my mask at home so I took a bounty napkin and covered my mouth and nose. I never thought it would be such a big deal. So at the store I’m not sure if it was an employee or manager But she asked me with a nasty attitude if the napkin wrapped around my ear. I told her no, so she told me I couldn’t be there and that I had to leave. She said it with such a bad attitude. In a fast pace I hurried my client who has a disability to hurry and pay. I took her to the register and there she was again and told me with such bad attitude that she didn’t have a register, that she couldn’t help me and I had to get out. It was so disturbing that I of course gave her back an attitude and walked out, left my client there paying by herself. It was so disturbing that I called her a name as I walked out. I have never felt so disrespected by an employee anywhere. I don’t tend to get into arguments with employers but her attitude was so disturbing and I feel like she could have at least told me in a nicer way. I apologize from my part on calling a name as walking out but never in my life have I felt so disrespected in a store.