I believe it's an "umm, what's with the incorrect use of "don't" in a sentence when you're giving us a thesis on someone else using incorrect English?"
"Informal writing don't have to be illiterate."
It should read: "Informal writing doesn't (or does not) have to be illiterate."
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Yes, it's umm, "Informal writing don't have to be illiterate." is a malformed sentence.
OMG, is that embarrassing or what!?
So much for proofreading.
Hoist on my own petard (**hides head in shame**)