How childish his name is or how much he is whining doesn't make it alright that random people can report names just for the sake of annoying people by making them change their names. It is ofcourse bullshit that you get offended by his name but not by other things in the game.
I've heard of many cases where people or guilds got their names reported and were forced to change them when they were not offensive. There are just a lot of childish people playing WoW who think it is funny to report others just to troll them and Blizzard is helping them. Or do you really think that the word poop offended someone? They might have just reported him because they hated how childish his name is. Good reason to force a name change on someone...