This is only my own personal experience but my parents became middle class when I was a teenager and I started going to private school and having my material needs much more easily provided. During college (UK college, so US high school equivalent) almost all the mates I made were working class and I became much more aware of the struggles people faced. University onwards this only deepened and I was well into anarchism by the time I hit 20. Realising I was being financially abused by my parents, distancing myself from them and living most of my adult years as a working class person for the most part and also being homeless a lot of the time of course really helped to open my eyes. Before I started getting that true awareness I wasn’t prejudiced or judgemental toward working class people, but as I say I just lacked that real awareness of how society is structured to keep people struggling and marginalised in various ways. If I’d stayed in that middle class bubble I feel I could well have been just like these young middle class people who seem to think people are on an even playing field, for the most part