Country music.
(A few of the radios in the Shop at work play country music most of the day. I don't think the playlist has changed appreciably in 4+ years.)
Food chewing noises, or slurping coffee.
Fingernails on any ceramics, particularly rough ones. (I guess it's not so much the sound, but the sensation of it.)
Interestingly, scratching styrofoam, or even squeaking two pieces together, has no effect on me.
I hate those damn high pitch frequencies that I'm not supposed to be able to hear any more now that I'm in my mid 30s. I can still fvcking hear them!
Hm, I need to find a CRT and have a listen. I could always walk into a reasonably-quiet room and hear the high-frequency whine from one that was running.
Singers taking breathes between words. Once you notice that shit while listening to a song, all you hear from that point on is, "Gasp_____Gasp_____Gasp"
Or a slight lip-smacking when opening their mouths for a new line of lyrics. Just a brief, very high-frequency click. Every time.