Murf didn't try to "change the argument.

Murf said outright and straight up that your "point" is pointless.
It doesn't matter
when Obama used a pornagraphic and utterly inappropriate epithet to describe concerned American citizens. He's still a giant hypocrite for doing it.
The adolescent preoccupation with the word "teabagger" is one thing, when it comes from actual adolescents. It's something entirely different when it's the President of the United States.
Now, this guy has been nattering on about "civility" since he started taking flak. It's easy enough to find plenty of examples of it on the web if you bother to look. Here's one such, article dated January 20, 2009. Bear in mind that his "teabagger" quote was from November 30, 2009.
Hell, even Warren's prayer at his inauguration called for "civility". It's a word that Obama, himself, has used frequently. So, it didn't matter if the original article said that the book had been released "just three days after Obama's call for civility". It's been an ongoing situation in which Obama has consistently set one standard for himself and his administration, and another for his critics. Or have we forgotten him snickering like a 10 year-old as he intimated that Sarah Palin was pig in lipstick way back during the campaign?
The issue isn't timing. It's that the guy is a total hypocrite, utterly lacking in self-control.