Yeah, on my server / battlegroup it's definately not jealousy. The horde side tolerates their boxers very well. They give them a chance in wintergrasp they don't always have. They are underpopulated and boxers are like mini heroes....

However due to this the alliance side has hated their own boxers for a long time. It's just now starting to come around since there is 2 or 3 alliance side boxers now. It used to be anywhere i went i got spit on or called a noob or Bud-spy (Budkins are the well known horde boxer on my server). When I stopped PvPing and starting keeping to PvE only and single-box raiding all of the sudden it's this huge benefit they can call on when it helps them. Even for PvP occasionally I'll get asked to go "deal with x" thats causing someone problems.

It doesn't help that boxers constantly camp our wintergrasp vendors while we control them.... Which is borderline griefing and reportable 'to them'.

Now on the other hand, once I rolled a multiclass team with non-related names. No matter how much coordination or autofollow I use, noone realises or cares that I'm boxing.

So, in short, the better you are the more you are alienating your opposing faction against boxers. And it seems to be only iconic 5 shaman teams that make everyone rage.