>>315752646
That's not really the meaning behind that proverb. "You can lead a horse to water, but you can't make it drink". The point of the proverb is that unless the horse wants to drink, leading it to water is pointless, no matter how many times you do it.
If your friend isn't willing to acknowledge they're doing anything wrong, it doesn't matter how many times you explain what you think they're doing wrong.
Same conclusion though. If they refuse to acknowledge any fault, and you still feel there is fault on their part, it's time to either tolerate or exit.