Just stop playing healer

[AmiableApkallu]

If you don't enjoy healing, then don't heal. No one needs to announce what they like or don't like playing to the player base.

You might want to pop into the game, and then take a read through System > Support Desk > Contact Us:

Feedback and suggestions regarding FFXIV can be posted on the official FFXIV General Discussion forums.

While it's technically true that no one "needs" to announce anything, the game itself literally gives permission to do so. There's no need to complain about people availing themselves of the opportunity.

If they were serious about not enjoying healing, they would not play healer for anyone or for any reason.

I'm quite serious about not enjoying packing and carrying heavy boxes every which way just because someone tells me to do so, but if a friend asks for a bit of help moving into a new place, in the words of the great Gimli, "They have my effort."

That's how friendships and other relationships work. You do a thing you don't enjoy because your friend understands you don't enjoy it, appreciates that you're going to do it anyway, and will endeavor to do the similarly for you in the future.