I think a few of your are missing the point. This guy NODDED at that messenger. I'm pretty sure giving a sign that you exist and are a person isn't trying to get into your cadre of elite friends. I nod at other cyclists because we're out there fighting traffic and sucking exhaust all for the sake of being on a bike.
Nodding is polite, rolling your eyes is not. Being a dick last time I checked doesn't score you any cool points.