That's another thing. I'm not a Grammar Nazi/prove-you-wrong type guy in real life as opposed to online. I find it rude (and unbearable) to point out others' mistakes. One example is when someone told me that my Etymotic HF5 was an earbud (actually an IEM) and that earbuds are generally bad for your hearing - also that he hates when people call earbuds 'headphones'. He's wrong on all three statements, but hey; I keep my mouth shut in those instances. Not so much for him; he's still a know-it-all type guy. Like Sheldon Cooper. Except he's not too smart; he just knows useless trivia.
Online, it's a different story. If I see a mistake, I make a list of why you were wrong and occasionally get mad for it and call you an idiot or a result of inbreeding. Well...
Anonymity corrupts.