My approach is to wave when I can and enjoy the response when you get it. Like others have said, I’m not going to pull my hand when I need it and I hope that no other rider does either.
Some other riders just aren’t into it and that’s their deal. You have no idea what the other guy is dealing with, could be rain grooves, pothole or trash in his/her lane, mommy didn’t love him the same as his older brother??? I’m not going to sweat someone else’s issues — whether they are relate to controlling the bike in the moment or attitude.
Go ahead and wave. If I can, I’ll wave back.