I have a bit more.
-People who shout that the LHC is going to be the end of the world. Instead of doing a bit of research into the matter, they just take what they hear from other people and keep spouting it off in different directions. I've seen a lot of doomsday sayings over the years, and none of them have come true. You would think, by now, people would start to realize how ridiculous they're being.
-People who can't tell the difference between "their", "there", and "they're". It's not a very difficult concept, and I still can't believe how many people are hung up over this. Although this is more of a minor annoyance than something that makes me lose faith in humanity.
-Lastly, people who condemn and make fun of others because they read for leisure, not just because they have to. And these same people make fun of others for being smart. I just don't get it.