Its always been this way, and it doesn't seem to be getting out of hand. I have a handful of EU friends from SSDD, I think both sides will agree that's its only natural to talk a little smack and spark competition.
Yeah a little smack back and forth is all for the fun on it, there are a few people that I think really do post a lot of bad about the other side but the other side knows to take them as a troll (and feeds them a lot) all for the fun of things.
With the EU bracket pretty much dead right now I do see a lot of EU players coming to the US and we will be intergrated a bit more than normal but hopefully the EU bracket will come back on Monday where everyone is starting to have thier old school/work/wow schedule.