Any power metal band newer than, let's say, 1998. (Seriously, I've heard enough castrated men singing about dragons)
Any band that is best known as "that band with the chick _insert instrument here_" Seriously. A woman playing an instrument isn't a reason to get a woody for some crappy band.
Ska bands, in general. Okay, it was cute back when a couple punk bands decided to play some Bob Marley, but now it's just out of goddamn control.
Any band that sounds like a cheap knockoff of Nirvana, or Pearl Jam. You're not necessary. We had all the mumbly, drug-addled longhairs we needed in 1993. Yes, I'm talking to you Mudvayne.
Cover bands. Sorry, but I don't need to hear some idiot's version of "Michelle" when I could just go buy the CD, give Michael Jackson his money and listen to the real version. Write some of your own shit you talentless hacks.
Metal bands without a sense of humor. I'm not kidding here, I'm sick of super-srs metal bands. You play a style of music that hasn't really been too popular for 20 years. y so srs?
There are others, but I can't be fucked to care enough.
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Do you want ants? Because that's how you get ants.