Something I haven’t seen discussed, and am interested in (disclaimer: The 400 Blows is the only “Doinel film” I’ve seen) is that both times I’ve seen this movie, Antoine struck me as either a textbook “gifted kid” and/or is clearly suffering from ADHD. I know the character is semiautobiographical, but some Googling of Truffaut and ADD/ADHD didn’t really yield any results. What’s interesting, though, is how accurately he portrays a kid so out of place – based on my own experiences/those around me, a lot of Antoine’s decision-making and behavior would be explained by either/both, and Truffaut (and more accurately, Jean-Pierre Léaud) nailed it to a T – from the way he holds his head in certain scenes, to a lot of the character’s mannerisms, and dialogue. I’m just not sure whether or not that was his intention, which makes things especially interesting. I’m not sure how familiar others on this board are with gifted education or behavior of kids with attention deficit disorders., but it’s an aspect of the movie that I absolutely couldn’t ignore.
This strikes me as a whole bunch of confirmation bias laced with selection bias all brought about by a big helping of projection. Are you sure you're not just projecting your own impressions of yourself onto Doinel?