What I find pretentious is the legion of commenters who can't find anything better to comment on and instead pretend they're smart by nitpicking some stylistic choice in the most low-effort way possible.
Classic case of "you're pretentious", "no, you're pretentious". It's exhausting how often we reach for the word "pretentious" when we have bitter feelings about one person's opinion of another person or their work.
I just used it because he did. My real feeling was exhaustion. More of those comments than comments about the subject matter of the post. Like going to a swimming meet as a pro and finding it full of kids instead.