Library Lady

Context: the other day I was at the front desk of the library, checking out my books and picking up some items that I'd requested. I received a notification earlier that they were available for pickup.

MaryAnne: "Hello."
Library Lady: takes books
M: fishes around for card
LL: stares at MaryAnne
M: hands over card
LL: scans card. "You have a fine of $2.55"
M: "I don't have any bills, but I have some change." pulls coins out of wallet.
LL: "Ugh. You don't have to pay now."
M: "No, really, I have some right here."
LL: "You don't have to pay now."
M: "Well here's a start." hands over money
LL: rolls eyes "40 cents?!! Ugh." goes to register. Sighs.
LL: scans books "Do you want a receipt?"
M: "No, but I believe I have some items on hold that are ready to pick up."
LL: "You don't."
M: "Wha . . . are you sure?"
LL: "Yes."
M: "But I--"
LL: "You don't."
M: "I recieved a noti--"
LL: "--you have no items to pick up. Do you want a receipt?"
M: "No."
LL: shoves books across counter
M: "Thank y--"
LL: "NEXT!"

Ha. I don't post this because I was mad or anything. I just wonder. Why? What made library lady do that? Ahh, the mysteries of the mind. Let's give her the benefit of the doubt. Her contacts must have been scratchy, the register sticks every time it's opened, and the computer request system is faulty. Okay, she's clear, but at the same time, is she? She's human, she makes mistakes, she has bad days, slipups. But I'm human too, do I always deserve to be treated as such. As a true equal? Do I deserve that same benefit of the doubt?