Bullying happens all through life. Coworkers, bosses, even neighbors/strangers will try to bully one another in various ways. It may be with more tact than the bullying delivered by a 5th grader, but it's bullying nonetheless. It's something you have to learn to cope with, defend against, and be more resilient toward. Taking a kid out of the school and putting them in a new one teaches them absolutely ZERO life skills for when it happens to them as an adult. It may not be an easy process for the child, but it's something they're going to have to learn to deal with at some point in their life. Parents need to get involved, talk with the kid about the harassment. Get them involved in activities that they're good at so that they have something to have self-esteem about.