Frankly it doesn't bother me, but I was never very good at English. You would think that three years of Latin would've helped...nope.
Yeah. Our "accepted" mistakes become part of the language. Actually, there are the "prescriptivist" and "descriptivist" schools. There are even different dictionaries for them. Merriam-Webster is descriptivist, AFAIK. If you asked a prescriptivist if "irregardless" was a word, they would probably tell you that it is not.
There is always change in our language, but it just happens faster with descriptivism.
What is also funny to me is how the "spell-check" implemented on forums underline in red some words I think are spelled correctly. I barely pay any attention to the red markings.