Some of us are too old, but in the mid 80's and up until the 90's children were being praised for mispelling words. It was thought that by phonetically spelling things, kids were using their brains and logic skills to decipher things. Unfortunately, teachers up into the 8th grade adopted this practice, even scolding parents for correcting their children when they would mispell words!
The study that showed this reign of thought also said that children should be encouraged to spell properly after the 2nd or 3rd grade - which makes a lot more sense.
I only know about this, because we had to do a cause and effect essay on an article regarding how terrible our educational system has become - and how one of the main causes for poor grammatical and sentence structure skills stems from lazy teachers, and a flawed educational system.
I would still venture to say that a lot of the people on here who are mispelling words were not raised using English as their first language.