TWeaK

I'd agree that it's kind of asshole-ish, but not full blown asshole. However, it's perfectly legitimate to do, meanwhile sitting in the middle lane is explicitly illegal in most cases. I did find that it was better to slow down with the brakes, if only lightly to show the lights, as just taking your foot off the throttle was more likely to confuse. Also, I was sure to make it two separate lane change maneuvers with clear space in front of them, not just sweeping across two lanes across someone's nose.

Also, slowing down so that they pass you inevitably hurts you, as you end up accelerating more than necessary and reducing your fuel economy. Tbh, I don't do it that often, precisely for that reason.

Frankly, I wish beginner driving instructors would teach what I learned in advanced driver training:

If you're not overtaking something within 10 seconds, you should move to the inside lane.

I ended up working to 7 seconds, as I found 10 seconds was sometimes hard to judge at distance, and by the time I hummed over it I was well within the bounds of staying out. Meanwhile, if you ever drive in the Netherlands you'll find people cutting your nose off all over the place - they pull in right away.

I miss having a car that didn't have timed pulses, like where if you tap it once you always get 3 blinks. I used to love overtaking people sat in the middle lane and then mash-tapping my inside indicator, as if to say "RRRAAHHH YOU SHOULD MOVE OVER!!" and then I would latch it on and blink normally while I pulled to the inside clear lane. Half the time, people understood what I was getting at and moved over themselves.

The other move on middle lane hoggers was to overtake them, move to the inside lane, slow down so they pass you and then move out and overtake them again. The game was to count how many times you could do this before they moved over. I never got a very high score.