Yeah, that was fairly odd...there's plenty of examples of socially inappropriate behaviours on the forums but not wanting to play a healer surely can't be one of them.
I remember during the playtest the discussion re: healing and how it looked like the cleric was going to be a must in the party again. I hated that idea for a few reasons, but one of them was that it necessitated the existence of religion and/or gods/some kind of spirituality. I was hoping to play a different kind of setting, and the demand for healing in the form of the cleric made that virtually impossible.
Playing D&D since 1e, I can attest to the "short straw plays the cleric" idea...with an NPC thrown in. Same in 2e, though at least then people could specialize with spheres. Similar idea in 3e, though at a certain level, the cleric turned into such an ass-kicker that the demand for healing dropped significantly.
IMO, 4e did it right in 2 ways: One, firmly embracing the nature of hit points, allowing for the existence of the warlord class. Two, healing was a minor action, which meant that the healer was never forced to choose between healing and another type of heroic action. They got to do both. Even their buff spells often triggered of other such actions. Not coincidentally, we had more pc clerics in 4e than we did in all the other editions combined, no exaggeration.
Having said that, I am not sure the burden is as great in 5e as it is in 3e and before. In those editions, you had to prepare specific spells (3x cure light wounds, 2x cure critical wounds, etc.) In 5e, you use one slot out of 13+ to prepare a healing spell, and that's about it. Maybe you use slots on it and maybe you don't, but you aren't nearly as "locked in" as you were in 3e and before. So while I suppose technically you are playing a healer, it's only when direly necessary. And 5e did include healing word as a bonus action so the cleric doesn't have to make that tough choice anymore.