Yeah... I feel sorry for the wimp, because the others sound like they were being awful, but personal experience has taught me that someone cannot bully you unless you are a willing victim.
I mean, you do get bullies picking on much littler kids sometimes, but generally it's teenagers or adults in the workplace acting this way towards their peers, and it is social fear, low self-esteem or desperation not to be invisible making the victim 'take it'.
I was bullied and I didn't have any coping skills because my parents taught me to be quiet and meek and rely on the approval of others. When I have kids, I'm gonna raise them to be able to stand up to any bully.
Perhaps you can let wimp know that you think he's a nice guy, and that the others were being douchebags, and remind him that he doesn't need to have their attention or approval by accepting their douchebaggery.