Spelling

Why do some people get annoyed when someone writes with errors. Well, the man was mistaken, the meaning is clear. And the error on the meaning does not affect. Moreover, we determined that it was a mistake and we know the correct spelling.
So this is it. Mistakes distract our attention. Rather, not ours but our brain. They violate his work and make him distract from the main topic and solve a completely different task, namely, correcting the error. Not written of course, but in the mind. If this constantly repeats, then it starts to tighten up and of course we begin to get angry.
Write correctly, I read you, think about others.

By Adrian Pingstone at en.wikipedia - Own work, Public Domain, Link