...well, if he was working in his home office, or the President’s personal office, one of at least two on the premises, that would be fine. The West Wing however is the headquarters of the public office of the President. Just a different style. Just a different level or reverence for the office.
and the issue is that this was INTENTIONAL; I think more of a slap in Bush’s face. There is no way he didn’t think this through.