Or you can judge how to approach each interaction individually instead of applying a global veneer of fake pleasantness that the US work culture labels as "being professional".

I think much like the author’s writing it’s a very polarizing thing, and it either clicks with people or doesn’t. For those that it doesn’t I can understand the viewpoint that it’s extremely negative.

I disagree that it’s inherently rude or aggressive. You can absolutely tell someone they’re a moron in a very polite and joking way, but it clearly won’t translate into writing very well.

As for crass, yeah definitely ¯\ _(ツ)_/¯