It depends upon who you're talking to.
It at least used to be something we were told about in school science lessons - it's how I knew to refuse when my boss at my Saturday job told me to put disinfectant into a bucket of bleachy water to mop the floor at the end of trading. There's no reason why my entire class, and presumably as the teacher taught for many years, thousands of people grew up knowing this - but I suppose some of them weren't listening.
But we had a rather rough and ready attitude with our teachers to keep with the rough and ready cohorts, rather than everything being all nice and gentle all the time in case the poor dears were traumatised. I know that I got some some very pointed 'looks' from colleagues at one workplace on some occasions (conversations truncated slightly);
Kids stuck in lift, shouting down from about 2 foot below ceiling level - 'I can get the doors open and climb down, Miss'
[brief conversation along the lines of no, stay where you are, but I can fit through there and sounds of movement too close to the bottom of the doors for my liking]
'[child name] Have you not seen Resident Evil?'
...
...
'Oh. We'll wait then, Miss'.
Kids refusing to remove jewellery/watches/tie long hair back in the workshop. Constant arguing, all getting a bit huffy.
'Look, you've been told repeatedly that you don't get to use the lathe/pillar drill/whatever until you [whatever]. Tell you what, you go over to the computer now and Google 'Degloving injuries' and then come back and tell me that I'm making a fuss about nothing'.
'Yes, I am fully aware that I can't physically stop you going over the fence. However I would prefer it if I didn't end up having to search amongst the fox faeces for where you last left your finger or climb over it myself to give you company whilst you bleed out from a cut to the brachial artery. It's dangerous. And I certainly don't ever want to be in the position of having to provide firm pressure to your groin whilst we wait for the air ambulance.'
I was clearly dealing with much older kids here. But they did seem to get the idea after they had the risks made very clear.
There was one adult staff member. He got both barrels, as he was instructing kids on drilling for a garden thing with a very large drillbit whilst wearing sandals and using his feet to hold the two extremely heavy and wobbly sleepers together.
'Sir? You need to stop and put on some appropriate footwear before you continue. Why? Because if you drill through your foot like you're about to do or one of those sleepers falls onto it, you will get first aid but absolutely zero sympathy from me.'
(as I walked away from that one, I could hear the kids giving him stick - 'we told you to wear your boots, Sir. You can't argue with her, she's right' amongst other things. When I walked past next, he'd put his boots back on).