Confused by this conversation, does anyone have an idea what went wrong

[SkatingWithPenguins]

I’d just used the self scan machine at the library. It’s broken, you normally just pile up the books but at the moment you need to open them to scan the barcode inside. Everytime you scan it opens a meaningless error message too. You have to click the x to close it. Annoying, but it works.

I was talking to my friend, librarian just finished a shift and in uniform, her son isn’t well and we were probably very deep in conversation in a corner. Very angry woman cut across us and said ‘the machine doesn’t work!’. My friend was approached from behind and was a bit wrong-footed, had jumped out her skin in surprise and as collecting herself (it was like someone shouting ‘boo’ from behind it was so sudden and loud). So I just smiled and said
‘It works, it’s just playing up. You need to open each book individually And scan the barcode inside. It’ll give you error messages, but ignore them and close them. The books will still be counted’
She glared at me- ‘IT DOESNT WORK!’
I’m, ‘give it a try, just open them’
‘IT DOESNT WORK, I have tried‘
‘Did you open a book?‘
So she throws them, closed, onto the machine and angrily points at the error message.
So I just said, calmly ‘the books need opening’. She picked them up, still both closed, and started flinging them back down to raise her voice more.
My friend then starting offering to do it for her (not really meant to with Covid rules, but was trying to diffuse it). Got as far as ‘shall I do it for-‘
The women then screamed at her, I’m not standing here being told off by you! I feel like I’m being told off! I’m going to the desk!
The new librarian on the desk looked over worried, people are mean to use the machines right now. I didn’t stay to see how it panned out.

The machine does have a sign on it explained how to currently use it.

She was about 30, seemed well presented and otherwise normal.

It’s bugging me as I’m struggling how it went so wrong, how I ended up being shouted at in public. I was genuinely happy to help her use the machine that annoys me, no edge to my voice.

I think you've been very thoughtfully self-reflective here, OP - it's certainly not that helping people (or doing what you think of as helpful) is wrong, but that it might not always be interpreted as helpful by others. I think the mantra 'do unto others' is not always helpful here - you might have appreciated a stranger advising you in the words you used, but that doesn't mean others are obliged to feel the same.

Ah OP, you're very self-aware. That is a very good quality to have. Don't resign yourself to not speaking up, ever. But maybe next time say something like 'there's a knack to it, do you want me to show you how I manage it?' asking people if they want help gives them a choice.

When people lose their shit so quickly it often means they have other stuff going on either mh, in their life or just their personality. It's not normal to behave like that.

You are being unreasonable coming on here without having stayed around to see how it all panned out!