It’s also very insulting to imply that all some group of people is likely doing all day is throwing heaps of coal into a furnace. Even most seemingly simple blue collar jobs are usually pretty detailed and complex in their own way.

> It’s also very insulting to imply that all some group of people is likely doing all day is throwing heaps of coal into a furnace.

Indeed. Not to mention that no one has been doing that for a very long time. That's not what coal miners, nor has it ever been what coal miners do.

A guy who shovels coal into a furnace was called a "stoker", and that unskilled labor job was automated out of existence about a hundred years ago.

A coal miner is a skilled laborer who (nowadays) uses advanced machinery and technology. Look into how "longwall mining" works. It's pretty cool.

It's very insulting to factory workers or miners to assume off the bat that they can't learn or acquire new skills.