I don't measure intelligence on ability to spell. If I see somebody constantly misspelling a word like weird, which is commonly misspelled, then I'll correct them. Cause what is a little bit of knowledge? But accidentally misspelling a word, I don't really care.

Here is what I dislike:
wut iz ^

Or even worse:
h0wZ iT g0iN wUt u b33n up t00 i sEeN u aT da maLl

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