We've hired for several years and have come across this attitude on only a few occasions. However, I'm pleased to say that the majority of boat owners are both courteous and friendly, so we just ignore it when we encounter it.
I well remember one occasion a few years ago when we were cruising back up to Sowerby Bridge after one of our epic trips. I'd just entered the second lock at Brighouse basin whilst my travelling companion was stil closing the gates the first lock. The crew of a boat moored above the locks came down and shut the bottom gates and proceeded to fully open ALL the paddles at once then walked back to their boat, leaving me to fend for myself...despite me sounding the horn and shouting and the top of my voice they simply ignored me.
I can't remember ever being so scared whilst narrowboating. In a tiddly little 32 foot boat I was thrown all over the place - cupboards and doors opened, crockery and glasses hit the floor...not something I'd like to experience again!
As for waiting for oncoming boats...it we know there's one coming, then in the interest of water conservation we'll wait for them rather than wasting a lockful of water...so what if it's 20 minutes???? On a canal that's low on water, then that makes perfect sense to me. After seeing the Leeds & Liverpool closed last year because of water shortages, and scraping along the bottom on the Huddersfield Narrow, then it's pretty clear to anyone with an ounce of common sense that it's the sensible thing to do.
If anyone's in that much of a rush that they can't wait twenty minutes, then perhaps they should consider doing something else...
Janet