Agreed. Although it's so stupidly common that if you take much notice, you'll quickly become consumed with rage. Typos and mistakes are one thing; it's moronically persisting in making very simple errors that becomes tiresome.
That said, I do love a really entertaining typo.
The usage error that really, truly grinds my gears is imbeciles who wish to discuss the "breaks" on a vehicle. Why is this so widespread? I can't even understand why this happens, let alone why it's one of the most common mixups in English.
They're completely different concepts, completely different words, and completely different parts of speech. I usually just ignore these idiots, because if they're that brainless about communicating, they certainly don't have the attention to detail needed to safely work on their brakes when they break.
What we really need are context and reality checkers.
Oh, and here's a handy way to prevent another set of painfully common errors. This one doesn't really bug me that much, because it does take a little practice. But the rule is incredibly simple, and you should learn it if you want to be a better communicator.