We all have at least one person in our lives who has decided they are the grammar police and must impart their knowledge and the ability to shame even the most innocent errors, regardless of whether their linguistic prowess is welcome.  Turns out that from a scientific perspective, these grammar aficionados usually share a personality trait, and they aren’t always fun to be around. “I can’t hear you when you don’t use good grammar,” my friend Steve’s wife, Carol, says to him regularly. Yes, she’s one of those people who absolutely can’t resist showing off her impressive grammatical skills. She’s a nice person, even if she’s constantly pointing out the difference between “their,” “there,” and “they’re,” and loses her sense of hearing when someone is saying something incorrectly. I wonder if she points out errors in emails as well? People who think they are the grammar police usually share a similar personality trait: lower agreeableness. Irene Miller | Shutterstock A 2016 study from the University of Michigan found that people who act as the grammar police are huge …