Um ok so...
OP is not yet at Hard Mode Primals. He is just at Titan Story Mode (Lv. 34) for those of you who seem to be mentioning Titan HM tactics, or even the word "Garuda".
Tanks also have a responsibility to dodge AoE and make life easier for the healer. If they choose to be lazy about it, I suggest you find another party, because it's not worth the stress to put up with players who refuse to perform their role in the party. Tanks have a responsibility to make sure the healer can go on healing them for as long as possible by helping them preserve mana where they can. This includes: dodging Landslides, dodging Weight of the Land, dodging Dragon Breath - pretty much any AoE attack that can be avoided. The longer the healer's mana is able to hold out, the longer the tank is able to tank - please make sure they do see it this way. Some attacks are unavoidable - ie. Titan stomps, so for those attacks you simply have to be prepared to heal.
If they choose to be pricks about it, they are clearly not worth your time. This is when I would suggest you find another party. You should perhaps look into making some tank friends - perhaps join an FC, or an LS on your server, and see if they have people friendly enough to help you out.