flash backs that take most of an episode *cough* Naruto
cliff hangers since it hard to wait for the next episode if it is really good
worst of all, knowing every anime will end but you don't know how and if there are gonna be more seasons

actually scratch that fillers, fillers fucking suck. also i don't mind fan service in certain animes like romance animes but i mean fan service in anime that doesn't need fan service

1. Helpless, squeaky females - if females were REALLY like that in real life, who knwo what the world would be like today...
2. Fan service - as said how is seeing a pair of breasts going to help anything?

Personally, I'm not really bothered by the general fillers/dubs hate people have, but to each their own

The extreme characters in which they are overly indecisive, oblivious and stupid.
I hate when the story teases with a theme, romance, comedy, whatever they tease us with, just to not follow up and leave it like it was a joke compared to the rest of the work.
In a romance, when they decide to do something stupid and kill off the main characters and leave the ending open so that we have to "interpret" what actually happend. (Star Driver >:( )
Unnecessary fanservice. Yes, I love boobs. Yes, I love hot ladies. No, I don't appreciate you taking this serious atmosphere to "give us a breather" because you feel like this show is too intense. Stay consistent and see it f-ing through!
Fillers. Bleach.

1) Wimps without a spine
2) Moments of embarrasing truth

i hate when characters get power ups in the middle of a fight and they beat up the final boss like it was nothing when they were loosing really bad

What i hate is when most anime end the ending will suck so bad.

Bad endings
Wimpy male characters
BIG holes in the plot

And most of all when people interrupt me while watching anime

- Inconclusive endings
- Bitchy, abusive tsundere characters
- Recap episodes
- Flashbacks that we already saw (One Piece I'm staring at you, seven episodes seriously?)
- Annoying main characters ( Most characters in a lead's harem)
- Complex politics (Not bad, per se, but I dislike it being a main theme like Spice & Wolf)
- The standard misunderstanding/doubtfulness thinking that your lover/crush/parent/friend won't like you anymore. Especially annoying when it's coming form both sides. (Kimi ni Todoke is a great example)

Tsunayoshi Sawada for the 1st 100 some odd episodes of Reborn!.

Harem, it is in almost every anime i watch besides naruto i guess...

Example #1:

Character 1 (protagonist) and Character 2 (antagonist) are standing on buildings 100 yards from each other:

Character 1: (Low voice) I don't care about your goals...your dreams...you had to ruin other peoples' lives to get to this point. That's just wrong. I don't understand how anyone--human or not--could do something so brutal...so merciless.
Character 2: (With complete and utter comprehension of character 1's dialogue) (Low voice) If you knew how my life was lived up to this point, you would understand my situation completely. You would know exactly why these things happened the way that I made them happen. You're such a naive boy, believing that you can avenge these people. You, alone, are nothing but a fly in my way.

*Character 1, hearing everything that character 2 just said despite using a low voice over 100 yards away, starts to attack the brutal Character 2 in response.*

________________________

Example #2:

*Character 3 (female, in love with Character 4) and Character 4 (male, in love with someone completely different) are best friends, and they're walking home from school together, practically hand-in-hand:

Character 4: I don't understand what I'm doing wrong. I've tried so hard, using so many methods, to get her to notice me. She just notices that jerk, Character 5.
Character 3: Don't worry about them. Character 5's a jerk, I'm sure that she'll notice you if you keep trying...and you don't have to worry, because I've already noticed you.
Character 4: I'm sorry, did you say something?
Character 3: Nope.
________________________

I mean, c'mon. Really?

Not really hate, but awkward moments make me feel...awkward.
I also hate girls like Tiffa, Mikuru,Himeji,Siesta, and many more. before I used to think i hated them because of their breast size, but i was wrong, their personalities just infuriate me.

I just hate it when they start an anime before the manga even finishes and just like comes up with their own ending...yea not good >.<

It irritates me when characters in anime "solves" math, or other problems when they do homework. It's usually like this:

"First you do like this, and then you do like THAT. Get it?".
"No...please explain it so i can understand it!"
"Alright then...first you start by drawing this to that, and then that to this. Better now?".

Well, more than irritate me, it kinda makes me laugh. It's just too silly sometimes.