I don't know. My best friend from growing up was not bullied in any way (we were homeschooled and he was the popular one in our knot), but some sociology class in college made him internalize the notion that "names really do hurt" and it eventually tore our friendship apart. He couldn't differentiate between good-natured ribbing and bullying. I knew this guy for 25 years and "names really do hurt" turned him into a dullard who couldn't hang out with the guys and have a drink.