How common is discrimination when it comes to occupation or making money?

There was a post some time ago where a guy was basically beating himself up for not working a high paying job, while everyone else is a programmer, businessman or whatever. He recieved a lot of support, like job does not make a person, or that no one can be a milionare. But of course there were also people that were shitting on him due to his job. So i wanna ask if you have noticed something similar irl, or how prevalent is it?