Kim Dotcom legally changed his name, for whatever purported reasons (publicity, most likely). He willfully has chosen this as his legal name, and while the name (or his reasons) might be silly or frivolous, I think he is owed the due respect of calling him by his chosen name.
Other noteworthy examples of late have been Ron Artest changing his name to "Metta World Peace" and Chad Johnson to "Chad Ochocinco" (which he may have changed back, I cannot recall at this time).
Their chosen names may too be silly or frivolous, and I have seen media examples where they have called it out and said "forget that, I'm calling him Ron Artest/Chad Johnson, I don't care what his legal name is."
In my belief this is patently disrespectful, in the same way that it was disrespectful for people to call Muhammed Ali "Cassius" after he changed his name, and in the same way it would be disrespectful for me to call you by some name that you did not wish to be called by (legally, for religious purposes, or any other personal reason).
I do fully understand your stance and I wouldn't call it "wrong", I just don't agree with it.