Dear Healers who don't DPS

[Taika]

To me, the context of the quote was someone who was willing to boot someone indiscriminately for not DPSing and an extreme solution to a zero-DPS healer, even if there was no discussion made previously.

If there's a healer (or tank!) who refuses to do any DPS, a BRD who refuses to use any of their support abilities, a BLM who refuses to use their fire spells - after being asked to by their party members, the party has every right to remove the party member who refuses to co-operate. I don't think there's anything extreme about removing a player from a group if the player is refusing to be helpful to their party (I do think the post you quoted was offensively worded though). And surely even you will expect these things from your tanks, BRDs and BLMs (just not from your healers...)?

However, going into a randomly matched DR and expecting to players to play at a specific level (whether above or below their current level) is, in my mind, both foolish and arrogant of said player and makes them sound entitled.

We're not talking about some ridiculously high standard for expectation, though. All that's being asked (and, again, feel free to point out if I seem to be wrong with this) is for party members to try to be active and use all of their helpful abilities instead of refusing to be helpful. What's being asked from healers specifically is that they would try to be as active as their DD and tank team members instead of choosing to stand there doing nothing (or spamming useless abilities = overhealing). There's nothing "entitled" about asking each party member to try and be useful to their team. If anything, refusing to be helpful when you could, for no reason whatsoever other than you don't want to, and asking your party members to work harder than you seems much more "entitled" to me.