Some of my friends bought a tonne of bitcoin when it was around ~$100 because it was clearly the future. I'm still not sure if I was an idiot or smart to reject that
Regular stonks are incredibly flawed, or whatever you want to call it, and the general public gambles on them as "the next big thing". None of that is unique to BTC, albeit more extreme with BTC. One should look at a potential investment as both its real world usage _and_ increased speculation.
Both.
Smart because you realized that BTC is an incredibly flawed currency, or store of value, or whatever you want to call it.
Idiot because you grossly underestimated the desire of the general public to gamble on the “next big thing”.