There is class anger and then there is just simply envy and jealousy and sometimes insecurity. You can feel insecure because someone has all the credentials you're "supposed" to have, or a better this, or a better that, or seems to lead a blessed life. It's not isolated to the disenfranchised or the marginalized, it's a human reaction to seeing someone with something and feeling at your gut it's unfair that you don't have it and/or that you want that too and deserve it just as much.
I would wonder how old you are because I noticed in college a lot of college aged people associate themselves with the underdog, no matter what their actual upbringing or background, and like opportunities to point out how someone else is more privileged than them. Then again, I went to a liberal arts college and being oppressed seemed cool so~ A lot of it in my opinion was just immature individual jealousy (i.e. I wish I had a nicer laptop) coupled with a lack of understanding about actual socio-political place and time and sometimes big words and a rule mis-use of terminology. I remember one girl constantly bitching about how everyone around her was better off than her and was "bougie", even though she grew up in a nice big house in the suburbs, she and all her siblings went to college ("name" colleges even) and her father was an engineering executive and her mother was a nurse who voluntarily didn't work.
I also remember a friend of a friend who identified as working class and my friend took exception to that because the friend of a friend's father was a tenured professor and my friend didn't think that qualified as having an underclass socio-economic background.
I think in these situations a lot is in the mindset.
All of that ^^ is different from actual class tension etc. etc. etc.
Hmmm, I wonder if I just went off topic :P