The problem with this is that a lot of people playing the game are jerks. When someone is killing the xp, it would be nice if the group could let them know how things work without trying to belittle them. That's not the case though, and instead of being receptive, they're trying to out-belligerent the next guy, and now we have a clan of people who sacrifice their own personal time (that should be used improving their own characters, as they ironically accuse others of not-playing properly) in hopes of killing the xp of others.
Make no mistake though, while both sides are being aholes to each other at this point, the people who are spending time trying to ruin this for other people really need to get over it.