There's really not much to understand. He's pointing out an inherent flaw in capitalistic structure (that the market disproportionately awards some labor over o

There's really not much to understand. He's pointing out an inherent flaw in capitalistic structure (that the market disproportionately awards some labor over others, leading to gross imbalances and to runaway problems like climate change) and trying to convert what would be a legitimate critique of such a system (i.e. it seems bad that this economic system is structured in such a way that the social values we have are secondary to individual economics) into a character judgement "well, it's not my fault you happen to have the poor people hobbies lol!" It's the sort of dodge that's extremely typical of people who have gotten extremely lucky and benefited heavily from this economic system. If pg wound up taking up painting more heavily instead of programming as his primary means of subsistence, I damn well guarantee he wouldn't be reducing economic imbalance to a "natural consequence" of mere "difference of hobbies"