Common courtesy says you don't refer to another person in the room as "that one," especially if you know his name. Please don't pretend this is news to you.
Similarly, the "I was only using his full name" bullshit. Are there TWO Barak Obama's? Does anyone else get called by their full names? McCain? Lieberman? Palin? The use of the full name is rare; the explanation for use of the full name is to call attention to Obama's origins, to make the point that "he's not really one of us, he's foreign, he's different." Drawing attention to his race and origin, and never by his friends, only by his political enemies, only to deliver that one racist message, "This is not one of us."
Your problem is that as the underlying racism of the McCain campaign in particular and the Republican Party in general rears its ugly head in desperation, all other measures failing, it's messing up this nice whitewashed picture you like to paint for yourself of the U.S.A. as the repository of all the good and decency there is on this earth. It hurts you to see the racist cesspool that it really is. You can't face the reality. Make-believe is so much nicer.