It’s one thing to have a different opinion and giving constructive feedback. Asking someone to delete their repo is way over the line. If you don’t like it, simply don’t use it and move on with your life.

I really don't see the "culture". This is just someone being an overbearing asshole on the internet. They had people like this back in Usenet days.

Another example is job interviews where the interviewers often think that anyone who's good in tech XYZ should know some obscure facts UVW.