A lot of people see it like this: you can drop out of highschool, get an apprenticeship, wind up with a job, and start making money, or you can go to university, get your degree, come out with debt, then struggle to find work (depending on your degree). There isn't a stigma against tradies where I live, they're arguably more respected than writers and musicians here. They get paid more, too. Which is to say, they get paid.
It's harder to master your art/craft or get your doctorate, and the monetary value of your achievement will often end up being less than that of a highschool dropout. There isn't a 1:1 relationship between effort and reward, and naturally, that upsets people. I'd prefer if artists and teachers and whatever were valued above bricklayers, myself, but that doesn't seem to be the culture I live in. Or maybe everyone I've talked to has been an anti-intellectual who regrets not chasing their dream. It's possible.