All it takes for us is to continue to ignore stuff like this and it will continue.
It should not be acceptable. The Police should be setting an example - they repeatedly claim they don't have the resources (or will) to enforce traffic laws to any reasonable degree so the very least they can do is set an example.
It's not the cyclist's job to tell other people that they're driving in the wrong lane.
And presumably by that logic that they're doing anything else that's dangerous. I been told to '**** off, it's none of your business' when I've politely asked people not to use their phones while they're driving.
The reason Drink Driving has dropped so far is because it became socially unacceptable. That absolutely involved other people telling drunks in the pub that they were not going to put other peoples lives at risk by driving home.
The same needs to become true of speeding, phone use, etc etc etc