We use them because Zer0 deserves zero respect.
He is beneath contempt and forfeits any decorum from posters like me.
I am an old man but extremely juvenile where he is concerned.
I can't speak for Cobra, but for me it isn't about contempt or decorum. As you said, he deserves neither.
The reason I don't like most of the name calling is because it makes the poster look juvenile, and distracts from the rest of the post. It doesn't matter if the subject is Obama or anyone else, the effect is the same.
“I am an old man but extremely juvenile where he is concerned.”
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Me too, this is the EARA of Obamalamadingdong and the more names he is called the better. It is positively terrifying to realize that there are still people in this country who think he is a good president. No one will ever go broke by UNDERestimating the intelligence of the American voter.