I've twice remonstrated with ICE drivers at the AC chargers near my friend's house, which are almost always ICEd. People just treat them as ordinary parking spaces. One of them said, if I didn't park here somebody else would. The other said, we pay u's council tax too, which I didn't see was relevant. (I don't pay council tax in Calderdale!) There's always a come-back.
I had to wait a short while for a charger at Tebay, and when the first of the four drivers came back he was already on 97%. But then one way or another, by the time I'd finished eating etc., when I got back I was on 97% too. (Actually I did need the charge, because the bad weather was playing havoc with my car's efficiency.) Again there was one person parked in the next bay waiting. I stepped forward smartly, trying to look willing, and said, are you waiting, I'm going right now. The driver smiled and waved and said, when you're ready!
The thing about these chargers is they don't display the current % charge. I only knew about the driver before me because he had trouble unplugging and I went over to see how he did it, and at that point the SoC was displayed. Maybe that's the best way, but on the other hand it is reassuring to see where people are and that they're not all below 30% when you arrive.