Since I answered the "sound I like" thread, I thought I would answer this one too

Sounds that I don't like include:

screaming babies/kids
backyard dogs barking 24/7 because they're bored
rap music...and loud obnoxious music that rattles your windows...it's even worse after 10pm on a weeknight
vomiting
loud snoring
the sound of someone "snarfing" their snot up their nose
alarm clock buzzers (which is why I wake up to radio)
the sound of an animal in pain (I heard this a lot when I worked at the vet hospital )
people fighting
...