As has been said, tanks that constantly reposition when there are melee DD in party. Just move back after the AOE, the mob is frozen while casting and remains frozen while performing the animation, by the time the animation is complete, you should be back in place. ofc, if there are multiple AOEs you are avoiding, this is not always possible.

As for BRDs or BLMs kiting, this is annoying also, but there are times for it. Once, our tank DC'd in Halatali (HM) after pulling all the 3 packs of mobs. I was highest DPS at the time so had aggro on all the mobs. I proceeded to kite them around the opening circle until all of them were dead taking 0 damage.

Also, the final fight in Halatali (HM) if the drg targets me on brd I will kite him until the CNJ is dead (and the BRD too, if the party kills that one before targetting the DRG).