It's not just HN and reddit. It's anyone who's not living alone in the woods. Class consciousness is thankfully becoming more prevalent, and these days how could you not notice: the rich get richer, the 99% is worse off, the planet is being destroyed, there's no accountability, and electoralism is failing.
There's a large swath of pro-capitalism sentiment on HN because it's overwhelmed with people who've "won" the game at the expense of everyone else. I wouldn't be surprised if there wasn't thousands of millionaires that read this site at least once a week.