I have to admit, I was that person and never new it. Not so much with pronunciation of words, but with correcting a story for accuracy. My husband finally pointed it out to me and it shocked me into awareness. Now I sit back and let the the small inaccuracies go as it usually doesn't influence the heart of the message the storyteller is sharing. It also made me aware that my sister constantly does the same as I used to.
In terms of being corrected for pronunciation - I actually need it from time to time, but it doesn't bother me for someone to correct me. If it did get to the point of irritating me, I would try to find a gentle way to share this with the person, as they probably don't even realise they are doing it.