Parts of the statement are true. People from better off backgrounds to tend have higher standards of living compared to people from lower socio economic backgrounds. Access to education and finance etc. That is a fact.
As for P2F I have seen a mixed bag. Some were good, most sat around average and a few terrible ones. I know of people rejected by P2F airlines for being really bad pilots. Nearly all the P2F people I met did it simply because their home countries airline required political or family connections to get hired.
Most pay to flyers were not rich kids by any means. I know a few rich kids. They would never be pilots.