This is truly a difficult question. In many situations, people prefer to stay in the same lane, thereby making the few people driving in the extra lane to "cut ahead" of others look like assholes. It feels like a dick move. However, ideally, if everyone did this, and merged every other car (zipper method), it'd be more efficient for everyone.
So idk. I don't get as angry about it as I used to, but I'm still convinced there's something inherent about driving that makes you think everyone else around you is basically an asshole regardless of what they do.