It wasn't "embracing the outrage"; rather facing up to the fact that -- whatever the merits or lack thereof of his proposal -- the donor's language was intrinsically manipulative:

This windowless thing is just a bunch of crazy suppositions by an ignorant man.

At the end of the day, this just isn't the kind of person you want to sit down and do business with. No matter what dollar amount he's trying to jerk you around with.