People who are proud of their ignorance. I'm not just talking about the people who "brag" that they're bad at math or whatever, but the people who will chime in on a conversation about a TV show or famous person with a smirk and "Who?" when they're basically conveying "I don't stoop to such lowly pursuits, so I'm blissfully unaware of your silly pop culture."
(Just to be clear, I don't mean people genuinely asking for more information about something. I'm talking about the smug eye-rollers I've had the misfortune to encounter. Sadly, I've even seen this attitude in RIP Celebrity threads in other forums. Ugh.)
Look, I don't watch reality TV or read about the Kardashians, either. That doesn't make me a better person than those who do. Just different. It's even more absurd when I see it online, because then the person is also telling everyone that they have no idea how Google works.