As a jungler, I hate players pinging for lane assistance at level 2... when I'm not even through the 3rd camp.
As a jungler, I hate players who ping for a gank when they've pushed the enemy under their turret. I am NOT going to tower dive for you. I also hate when this same player gets ganked because they're over-extended, and they blame me for not ganking their lane.
As a laner, I hate being camped by an enemy jungle, especially if that leads to the enemy laner outfarming me. Even if the camp isn't a successful gank, the fact that I'm permanently pushed back and on guard annoys me to no end.
As a support, I hate when my ADC does not focus on objectives.. Example.. We double kill enemy team and have a wave pushed to their turret that has 500hp. Enemy jungler comes in. ADC runs away instead of doing the 1 auto it would take to destroy the turret and then turn into a 2v1. I usually die in this process as I'm trying to destroy the turret. Another variant is when they CS instead of attacking the low health turret.
As a team player, I hate.. absolutely hate... when my team chases an enemy into an unwarded jungle. It almost ALWAYS ends badly. Baiting is sometimes just too damn good.