@Frank Apisa,
Many people who are very intelligent have trouble with spelling and grammar; sometimes that is associated with dyslexia. Sometimes we are better at some tasks than others, and that is often related to our individual brains. Some who don't care so much about spelling and grammar have thoughtful opinions.
Sometimes people who usually spell well make typos and aren't obsessive about that happening. Sometimes people have keyboards with stuck keys. Sometimes people have hands with a medical difficulty.
Spelling can be an indicator of a poor education, but I rather doubt that is any kind of given as a cause when you see misspelling.
I thought this thread was about the U.S.
It's not me with the downthumbs, though it might look like it.