The ancient myth of Irregardless

I have a teacher who says "irregardless" when she really means "regardless". This drives me up the goddamn wall. What does that even mean? "irregardless", that's a double negative you idiot. How did that even get started?

Some guy was like "hey how do I say the opposite of regardless?"
Then somebody else was all "uh..regarding?"
"No, no, it must be irregardless"
"I think that means the same thing"
"what? no.."
"yeah man, if something doesn't matter, that's regardless, you should have no regard for it."
"yeah but I want to say something doesn't matter"
"that's regardless"
"No, I think it's irregardless"
"why? the word already means what you want it to mean, you don't have to put an 'ir' at the front, it's already ready already"
"all ready ready already?"
"fuck you don't get off topic"
"I'm not off topic, you're off topic"
"the word is regardless, ok?"
"irregardless"
"You're an asshole"
"You are."
"I have no idea why we talk."

And hence, idiots have been saying irregardless and will continue to do so until the end of time.