autocorrector
A person who constantly interrupts you to correct your grammar, to inform you that something you said was wrong or to add detail to something that you are saying. Even if the correction is accurate or improves what your story, it's frustrating as heck. correction, correct, autocorrect, interrupt, annoying, iphone, smartphone, talk-over, talkover, last word
My brother is the ultimate autocorrector. Every time I try to tell a story, he constantly interrupts me to add unnecessary details to the story.