> I genuinely don't understand the angry and bullying tone coming across in these type of articles lately.

Uh, it's literally in the second paragraph:

'I’m mad because I’ve been hearing this line of thinking for years from many different sources, and—just like Alex—I feel in the strongest possible terms that it’s “astonishingly, gobsmackingly effective bullshit.”'

This is a theme that's threaded throughout the piece. For example:

'I kid you not, I was emphatically informed that my skills as a Ruby on Rails web developer were no longer relevant to “modern” developer practice.'

The point is: The author feels like they are the ones that have been bullied, for years, by folks pushing the SPA hype cycle, and 'ridiculed ... for [their] choice of technology stack/language/etc'.

And I can't really blame them.