A contractor in a town where the jobs dried up might work at Lowe's now for example, where they would be kept under 20 hours a week so Lowe's doesn't have to pay benefits, and they could look forward to living in a van off of social security when they retire (source - this is my brother in law at 55 y/o - he has no idea how computers work, and desperately just wants to go back to laying tile like he did for most of his life - lost work - got a job at Lowes a few years back - just laid off actually, due to the virus - he's 100% screwed). There are a lot of these folks floating around, and what has happened to them is absolutely tragic.
Ideally he should re-train in something, but what often winds up happening is that they get sucked into for-profit colleges that encourage them to take out predatory high-interest loans for training that lead to job markets that are either oversaturated, or misrepresented. Then come the payday loans, then come the repossessions.
Ideally those people would just buy a bunch of NoStarch books and become fullstack developers or something, but that's not how people work, unfortunately and we just haven't figured out a good mechanism to help keep those folks on their feet.
The person you're responding to is waaaaaay too angry, and I don't believe you deserve to be on the receiving-end of that, but they may be going through some really rough stuff right now. There's a lot of people who have suddenly found themselves unemployed and homeless and they may very well be in that situation.
https://www.pbs.org/wgbh/frontline/article/the-state-of-amer...
https://www.thestreet.com/personal-finance/what-is-middle-cl...
Tons of jobs we have now didn’t exist 5, 10, 25 years ago. Every time a mass amount of jobs are lost when an industry collapses, they always say “this time is different!” I just fundamentally disagree with that premise. There will always be work to do and someone willing to pay for it. If that ceases to be the case it would be the first time in human history, which seems way less likely than society continuing on like it has for millennia.
You also seem to think individuals are too stupid to look at the job market, see what skills are in demand, and self-select for learning a skill that they will enjoy and get compensated a fair wage to them. Every single person who loses a job, provided they eventually get off the government dole, will have to find something new to do. Working for a while at a restaurant or warehouse isn’t something they have to do forever. There is just a distinct lack of belief in human agency in your postings.