The fact is that money buys better health and familial outcomes. The parents want that for their kids. Manual labor, regardless of how well it pays takes a toll on your body and generally pays less than a lot of the highly sought after knowledge worker jobs.
I really think the rising cost of living is whats driving these kinds of ideas. The parents want their kids to make more money so they can have a better life - a reality in america. Others see this and assume that the blue collar job is bad or something.
If we had an adequate healthcare system that didn't favor the super rich with good outcomes, I would agree. Until then, my kids are going to be encouraged to go into a career where they can make lots of money sitting in an air conditioned office.
I've worked the blue collar tough as fuck jobs, and now I work in an air conditioned office making 15x as much. Objectively, which one is the better job?
I agree, not how it should be, but you gotta get yours.
Also, if you've ever worked in the trades you would know that a large portion of them are ignorant and uneducated. That stereotype exists for a reason. Its just a fact, and they have a tougher time navigating life because of it. I've lived it.