> The real question is how did society get to a state where “you will be happy” is an evil goal that people copypaste everywhere nodding conspiratorially to each other?

I haven't noticed this at all. Where are people talking about being happy as an evil goal?

The phrase "you will own nothing and be happy" is dystopian because it's not really saying that you'll be happy. It's more like a threat: "we will monetize every aspect of your existence and you better like it".