Obviously it's a problem for some people, because they don't know which version to use when typing. They don't have to "choose" when speaking, because they sound exactly the same (where I live...and probably where these misspellers live), so that laziness in not having to distinguish when speaking mixes things up when having to type.
They should be taught how to speak correctly, then. That kind of sloppiness leads to a poor image and weaker communication skills.
More specifically, they should go and see some kind of instructor to help them learn how to pronounce International English. These regional dialects are undesirable.
This is one thing I'm very "J" about, I suppose. I've never liked sloppy communication.