I can't stand Gerry Callahan,and his "angry middle aged white man" act really sucks, but there's not too much I can disagree with in his article,(assuming the incidents he describes are true).
How does a guy not take a few minutes out of his day to join his teammates in greeting and cheering up young cancer victims? And why didn't one of his superiors or teammates call him out about this? Perfect example of people coddling a supremely talented superstar. If everyone of my employees at my workplace chose to take some time to engage in a charitable endeavor to help out children fighting cancer, and one person chose not to join them, I'd never forgive him, and I'd think very long and hard about whether I'd want that type of person representing my business.
As far as Manny not joining his teammates in greeting Bush, well even a blind squirrel can find an acorn once in a while. IMO, that was a proper move, for reasons that aren't allowed for discussion on this particular blog.