Frankly, I haven't seen very many ardent Bush supporters that accepted a differing point of view with any grace. From my perspective, any criticism is responded to with sharp insults like anti-American, America hater, marxist, commie, whiner, etc. Of course there is no objective support for any of those charges.
Part of the problem is that many people convinced themselves that Bush was a Conservative despite the warnings to the contrary. Now it's gotten to the point where Conservatives like Rush are Hannity are unwlecome because they are pointing out their disagreements with Bush policies. They haven't changed, and neither has Bush, he just is't the Conservative people thought he was and wanted him to be.
The bigger challenge is what, if anything, can be done.