What jobs would those be? In my opinion, any job "helps others" and is "worthwhile to society" if it earns its way in a free economy.
That excludes many government jobs, most do-gooder-type nags, the majority of teachers, etc. Be an auto mechanic and be proud of it.
Again, when I was still in the Navy as a recruiter, most (not all, but most) kids would look down on someone like me who worked with their hands and wasn’t afraid to get dirty. Most of them thought they would go to college, get a degree in underwater basket weaving, then immediately get a corner office with a $100K salary. Hopefully some of them grew up when reality punched them in the mouth. But in my field, you don’t exactly have people beating down the door to get in, which is strange considering the pay, benefits, and job security I have are pretty damned good.