I'm sort of glad I didn't have an internet connection at home until I was 17, because I only got any contact with the attitude criticized in the post when I was already largely past teenage angst.

My experience is that gatekeepers often exaggerate the difficulty and importance of whatever it is that they're gatekeeping, be it languages, language paradigms or even architectures.

It's useful to call them out on this in particular when you're knowledgeable yourself.

My favourite example of this is people dismissing a language because its type system is unsound. The vast majority of people who brought this up in front of me couldn't explain how that prevents anyone from shipping products.