BobaBird said:I expect better from one who champions the causes of correct spelling and proper usage.
http://dictionary.reference.com/search?q=irregardless
From your own link, it says, "It is used chiefly in nonstandard speech or casual writing." This qualifies as casual writing and is, therefore, entirely correct. (For formal writings, the usage would be incorrect.) Now, you can stick your tongue back in your mouth and shut up.