I think it's a mixture. With exceptions, the middle class in particular may genuinely want good careers, while the working class have traditionally seen the world of work as a necessary evil. Not really surprising, as middle-class jobs are often relatively cushy.
Whatever the prevailing view about the downside of working for an employer, it's often seen as an ethic to get a job, probably because it's pretty much the only known way of surviving economically and being able to "pull your weight" instead of having to rely on handouts from the public purse, charities, friends or family. So "I don't want a job" rarely goes down well. I suppose a lot of people internalise that job ethic and feel guilty and inferior if they're unemployed.
Me, I have views both ways but mostly in favour of those who don't want jobs. I've no big problem with them, and I take a dim view of the idea that we "should" want to work for an employer. It seems a tad undignified to want to be a wage slave. I never wanted a job myself and if I'd been able to get good, sustainable benefits off the state for life, I might have gone that way. And I think if things were set up so that people could survive without having to work for an employer, it might drive up pay and conditions. While people are scared of losing their jobs, employers can treat their workforce worse and get away with it. There aren't enough good jobs to go round, and I hear a lot about employers taking huge liberties with employees, such as dictating working hours, demanding unpaid overtime, imposing new, worse conditions, giving below-inflation pay rises, dismissing people too freely, and one way or another damaging people's health. In a free market it's unlikely that any worker will get the full value of the labour they put in, which is a kind of robbery. They won't employ you if there's nothing in it for them. And even in a not-for-profit organisation I think the people running it are often rather jumped up, on some kind of guru trip where they get their sense of worth by being in charge of others, and I think they hide their incompetence a lot.
I've got some sympathy with the view that people shouldn't just sponge off any convenient benefactor, that they should try to do something useful with their lives. Just that it's hard on anybody who didn't have the upbringing required for them to be able to access the better jobs. I can't expect them to play fair and "contribute to society" when society itself is as unfair as it is.