Originally Posted by
Gemina
Your advice was unsolicited, and that's is likely why the healer got snippy with you. No matter how good your intentions are, you are literally being what you are trying to avoid, and your efforts are counter-productive. Even if the healer was receptive and started using Holy for mitigation and ogcds to heal, it would at best have made a small fraction of a difference as far as total run time goes.
You trying to get the healer to play in a way you find acceptable very likely added more time to the run that could have been avoided if you didn't say anything at all. And for what? Do you have any guarantee that your advice would be retained? Echoed to other WHMs? Will be grouping with this player again in the future, or bringing him/her into a static? If the answer to any of these is "no", then that is time and energy wasted my friend.
Oh and BTW, you also might want to consider that the healer was hard casting their heals because he/she doesn't trust you, and the synergy with you is nowhere to be found. Again, these gripes are very one-sided. It's so very easy to point fingers, or think they are being pointed at you, and if a run is going fine for the most part, then there isn't a whole lot of reason to say anything in the first place.