> how many people come out of the wood work to make disparaging comments about people who use cannabis

It's actually not even just HN. I've noticed this with many people in real life (US).

It's especially strong with the subset of Boomers who never used it. They make it part of their personality to have not used it, while often fully embracing alcohol and ignoring all of the personal and societal risks it brings. Surely they pass this mentality onto their kids with a 50% success rate.

Maybe it's some kind of inferiority/superiority compensation mechanism for not being a hippy like their rival sibling was, etc.