I agree. Found the "I know a few things" spiel distasteful, and the general tone to be patronizing and rude. Attitudes likes this are negatively impactful and points for or against notebooks can be made without the toxicity.
It's mostly a critical mass problem, as far as I see it. If everyone had a different more positive tone, the one bitter one would stick out (and mostly people wouldn't even think about choosing that tone in the first place). But since that's what a lot of people do, that becomes the energy-minimizing approach to take. I suppose the best thing one can do is to have the courage to go against the stream ("vote with your feet") and find a way to make your presentation optimistic and happy (e.g. Julia Evans), despite the fact that you know there will be bitter people who judge you as cringy.
