Wahiawa That’s Why

So I’m flowing from H1 Eastbound onto H2 Northbound and there is a green Taurus crawling up my back bumper.  After the merge, our lane becomes the second lane, with a fast lane starting from nothing on the left, and the two lanes from H1 Westbound coming in from the right.  Instead of simply getting into the empty fast lane (considering he wanted to go fast), he swerves all the way into the furthest right lane (the slowest lane), then weaves through traffic to eventually make it into the fast lane near the Ka Uka off-ramp.  Wahiawa that’s why?  What’s up with Hawaii drivers and the “pass on the right” habituation?