Family Dollar complaint: Cashier treats ppl horribly for months!

The cashier here the tall, bigger woman with very short blond hair has been horrible to customers and me for about 8 months since she’s been hired. She’s pumped her fists at me, she is very disrespectful… even when I try to be real nice. Last night my new debit card (that apparently hadn’t been fully activated didn’t go thru. She announce quite loudly in front of about a dozen customers behind me in line ‘MA’AM, YOU DON’T HAVE SUFFICIENT FUNDS’… it was humiliating. I told her it was just a new card and I had a few thousand in there could we try it again. Upon the second attempt she again looking at the crowd behind me said ‘MA’AM YOU DONT HAVE ENOUGH MONEY’. I pulled my VERY FULL cart of 150$ worth of checked out items to the side and tried to call my husband so he could watch the cart while I drove to the ATM a mile away. He wasn’t there, I had a feeling she would hide the cart so I couldn’t retreive my groceries when I came back. I was correct. I was literally gone 10 minutes (it is a small town) and DID use the ATM to retrieve the funds and complete my card activation 3 blocks away. I returned literally in 12:38 minutes. There was no way she could have put 150$ worth of groceries back in that time with a store full of customers. She must have just hid it in the back room. I tried to tell her in my experience as a former Restaurant owner that one should be discrete if for any reason a card is declined… but she interrupted me, laughed at me and said ‘I don’t care about your personal stories and made up crap… it was MY JOB to let you know that you didn’t have enough money on your card, if you were embarrassed that’s your problem.’ I asked ‘Do I have time to go shopping AGAIN to retrieve each item individually again? She said hurry your ass up, I’m going home and closing up’ She might have mentioned I had 5 minutes.
I have complained to the manager that was also hired 8 months ago before. This was like the 10th time she has been horrible to me or someone else. The newer manager seemed a bit meek and just shrugged her shoulders. She won’t do anything. Help, I love Family Dollar and it’s two blocks away. Do I really never get to go back there out of fear and humiliation?