I've noticed that most Mages, and Warlocks seem to get legitimately upset if you ask them for a Mage Table or Warlock Stones and in most cases straight up refuse to do it (this is in Battle Grounds). I've had several Druids rage about why they didn't have to cast Mark of the Wild when someone in a 5-man group asked for it. I constantly see healers refuse to resurrect other players in LFR (which is annoying because I don't want to wait 5 minutes for someone to run back so we can pull the boss). Edit: I forgot about this one. There was a Rogue in my guild who refused to cast Tricks of the Trade on other players because he was afraid it would bump their DPS above his.
Is this just me, or is anyone else noticing that this is starting to happen more often? If so, what do you think the culprit for this sudden anti-social behavior is?