Ignorant people going around telling others what to do/teach/learn/believe in. This particular umbrella pretty much covers everyone from fundamentalist creationists to quantum-chakra-based new-age woo-peddlers. They are everywhere, and one would think my skin would get thicker after a while when dealing with them so much, but instead my skin only seems to be getting thinner upon hearing the same tired, fallacious "arguments" and "philosophies" and other things they have no idea about.
Also, conspiracy theories. They are almost under the same umbrella as the first group, except while the first thrives on ignorance, the latter does so on cynicism and paranoia. I mean, have you seen the amount of conspiracy theories rising up from the whole Charlie Hebdo ordeal?! And if 9/11, Kennedy and Moon-landing conspiracies have taught me anything, they will only get worse, dumber and even more widespread with time. And, being the idiot I am, I always try to argue with these people for no apparent avail, which would be no big deal except one of these people is my own father.
And my friends wonder why I have no faith in humanity... -.-