"irregardless"

The behavior consultant I work with uses that word all the time and it makes my skin crawl. According to Wikipedia: Irregardless is an informal term commonly used in place of regardless or irrespective, which has caused controversy since it first appeared in the early twentieth century. Most dictionaries list it as "nonstandard" or "incorrect". The pre-fix "ir" is a negative like "irrational" or "irresponsible". Therefore "irregardless" would be a double negative and make no sense. GAH.