HAHA most of them are neutral, not nice. I have some bad experiences, I'll tell two of them in chronological order.
A currywhore teen, her queue was empty so I went to hers so I could go home quickly. She did not greet me, as is store policy, she just scanned my items without saying a word, not asking if I have a discount card, also story policy to ask, and when she scanned all my items all she did was wait for the money. She didn't say how much it cost or how much change I got either, also store policy and she did not even ask if I wanted a receipt, also store policy and I did not get one. She completely ignored me, that filthy currywhore.
Another supermarket but there was this ethnic female, right in front of me was a tall, white Chad-lite. She was talking to him all nicely, smiling, and when it was my turn, instead of scanning my items, she literally pauses to rearrange the money from the cashier machine which took like at least a full minute. I did get pissed off because I knew she wouldn't have treated me like that if I was even remotely decent looking. Superficial cunt.
So no, cashiers are a great way to determine how subhuman you are. I don't demand to get treated nicely by cashiers but to be a complete dick for no reason is just hurtful.
And I've got more stories from cashiers being cunts.