Ranting of a disappointed player (?)

[Zivren]

So I decided to recently return to the game, with the intention of preparing for Heavensward. Great deal and all right? That is until I forget that there's some few individuals that are just... completely brain-dead or just mentally incapable of understanding the game by 35+. My apologies if I'm 'flaming' or something but I feel the need to relate and/or rant to... SOMEONE, so people at least understand how frustrating it is to deal with that kind of behavior.

WHM - Basically thought he was a DPS and kept using stone every chance he got instead of healing me.

BLM - Trigger happy finger on LB button. Used it every chance he got, even at Lv 1 at the beginning of the boss.

BRD - Ignored my numbered targets and drew aggro needlessly for the entire run.

Is this a common thing to deal with nowadays in game? :/