I know what they're saying and I've often found it annoying as well. If such a car is following you and you get to the left or middle lane to overtake a slower

I know what they're saying and I've often found it annoying as well. If such a car is following you and you get to the left or middle lane to overtake a slower car then the car behind you first accelerates to your right as if they were going to pass you, then brakes because of course there's another car there, the one you are overtaking. The other case where I find them annoying, the worst case for me, is when I'm quietly driving my speed, overtaking a (slow compared to me) car that is following another one. But while I'm overtaking the "auto following" car, the car in front of it gets back to the right lane and the other car suddenly takes off much faster than me. So here I was, driving 110 and overtaking a car driving 90, while suddenly accelerates to 130... until it gets stuck again a kilometer further, and I have to overtake it again, and everything repeats. Of course, I could do the same acceleration/braking dance and stay behind them all the time, but I care about not spending fuel for useless speed changes.