What are the most hated chess openings?

Danish Gambit D:

a3,a4,h3 or h4

The correct answer is "The French!"

The other day I played a blitz game vs someone who opened with h4, h5 and h6. (and after I answered Nxh6, Rxh6.)
The trick with 'annoying' openings is to treat them with respect. Careless play will get you punished very quickly.

Petroff defense

the petroff for sure

Not sure if I understand the question...but I'm annoyed when anyone opens with 1.d4.  

1.c4 is still ok.  

My pet peeves are:

1. King's Indian Attack -- Not so much the opening itself, but when people play ONLY the KIA to avoid having to learn anything about the opening phase.

2. Ruy Lopez Exchange Variation -- I typically beat the crap out of it, but I'm a Ruy Lover (from either side), and this is the cheap way out.  I always feel robbed.

3. Smith-Morra Gambit -- Highly overrated, IMO.  C'mon, folks, the Open Sicilian gives you a nice attack too, and for free!

I don't really like the Sicilian Defense...people will try it against anything these days. I avoid theory...not that I have to, I just like to. I also don't like playing against 1.d4, because people never follow with 2.c4. I just find it somewhat annoying.

I would have to say that the most hated opening is the Wandering King. It's somewhat insulting to the other player although I believe it has nothing to do with the opponent of the player playing it.

The Exchange French.

Petroff.

Colle/London system etc. All those d4 openings that white plays regardless of black's moves.

grob

Exchange ___________.

petroff

Anti-Sicilians and Closed Sicilians - is it too much to ask to play one Open Sicilian every now and then? (not that I think most of my opponents are doing this on purpose)

I use to hate playing against the immediate double-fianchetto. I'm yet to play against it on this site.

+1