...there are a decent number of Less Wrong users who act obnoxiously high status in real life (including some who are quite prominent). I'd love to have the egalitarian norms you describe, but I think first we'd have to convince them to stop.

The way you worded this makes it sound as if there are a few people ruining it for everyone. If this is actually the case, then the solution is, when these people begin acting obnoxiously high status, say "You're being obnoxious. Stop." Bystander effect, etc. If you try this and it doesn't work, let me know so I can update.