I’m not bothered about them and there is no point in getting any rage. Overtake, drift across back into the slow lane and disappear at a vast rate of knots. Then have a chuckle as they are still sitting in the middle lane.
That's fine, until the idiots are bumbling along in the outside lane of a 2 lane DCW and either refuse to move over, or are utterly oblivious of anything behind them. I don't think twice about going past on the inside these days (though always check for plod first).