It really is take the player now not the class. Just about every class brings something that another class can do. Yes a rog with sap glyphed is awsome but there are ways around not having them. People that are kicking becouse of a class are either not aware of other classes changes or have been running with bads that cant play there class and it makes the kicker think the class is bad.
If this healer is just a guildy, then whatev do your thing with someone else. If this is an officer or RL then leave since that stupidity will drive ya nutz. Or tell him to DPS becouse priests suck.