where's the line exactly, between requirement and willing to out of respect?
That is easy, karrie. When one does not like Obama, anything he does is wrong at some level. He bowed to Saudi king? He is no better than a common servant. He did not bow to the king? Why, he is just a boor, an ignoramus who has no manners and is purposely trying to offend our allies.
With conservatives, the poor guy just can't win, no matter what he does. Incidentally, it was the same with Clinton (and with Bush). It is the usual highly partisan nature of US politics,nothing more.