"Heals????" basically states you feel you died because you weren't healed. So you put full responsibility for the death on the healer.

That said, to a degree I can understand it. There's nothing worse as a tank than dying, despite trying everything you can and the party assumes you stood in something or derped on cd's and gives you the tolerant "let's try again" attitude or even worse a "lol tank". So you place the blame automatically where you feel it's deserved, before the assumptions can be made. But then you don't know exactly what happened and no healer would like unfair blame thrown at them instantly. Like in the same way if a dps died to an add while you were mitigating an important mechanic or your mouse died and they instantly threw "tank????" at you, you might not like it. So perhaps a "what happened?" could work better.

But hardly the worst thing to say, especially if your overall attitude is friendly enough. Not sure why there's multiple pages over this.