I enjoyed the writing style. It's too long for me to read fully - I'm supposed to be working - the length and meandering adds to the charm perhaps. The person is clearly expressing themself.
Specifically I think the line between writing in a colloquial, sarcastic, dry, opinionated, florid, or satirical style; and being arrogant; is where we are overinterpreting things as the latter.
We seem to be sensitive to the idea that somebody might think they are "better than us". It seems often like an insecurity?
> the line between writing in a colloquial, sarcastic, dry, opinionated, florid, or satirical style; and being arrogant;
If the point they're making is clear, the prose is informative, entertaining and never boring, being smug is a writing style like any other, people will like it. If the writing is annoying, people will criticize the smugness, when in reality that just means they didn't like it.
It's also possible that the success of sarcastic, satirical styles drew a lot of people to these styles, and not all of them are successful in using these styles.
Take responsibility for your opinions, don't make your reader sift through vague intentions.