Ultimately, it's about the second part of your comments. You clearly think they are doing something wrong with their lives, or they are not choosing the optimal route for their life.
While you are obviously entitled to your opinion, I do have some reservations about this kind of judgement. People have different views of what is a happy fulfilled life for them, so let it be.
(I know how ironic my "stop judging people" judgement on your judgement must sounds like, it's a fallacy I haven't been able to solve yet)
Sounds fine to me as long as we judge people based on their decisions and the impact those decisions have on a non consenting 3rd party.
I'm concerned with people choosing their preferred route for their own life, as long as its the preferred route with the minimal amount of negative consequences to the rest of society.
I think the concept of "stop judging people" is hugely misrepresented. It should be "stop judging people based on things that do not and will not affect others", because really, telling someone to not judge a rapist for being a rapist is pretty bad.
So sure, they may think the same about myself, however I'm not costing the taxpayers money with my shitty decisions.
"Why should we mock people who want to learn about their world and learn about themselves?"
Because you don't need a damn Liberal Arts degree to do that. It didn't cost me 5 figures to learn about my ego and my id; It cost me 5 figures to get a CS degree while doing so.
I also mock those with children, but only because I currently don't know a single person in my circles that should be having kids now, if ever.
When I hear a friend is pregnant, I just get depressed about all the opportunities they'll never have.