I found it on Zap2it, and it would be nice to read the whole response (it was an email) but they haven't put the whole thing up either.
"Although he hasn't yet received a response from ScarJo, Williams tells Zap2it that if she accepts the invite it would, "truly be an honor not only for me but also my fellow Marines ... Not only does it show their support for our troops, but it also [boosts] the morale of Marines as a whole."
But, adds Williams, he'll understand if she can't make it.
"I would not believe the invitation would be denied without good cause," writes Williams in an e-mail. "With her current career I would imagine Scarlett Johansson is a busy woman ... Nothing ventured, nothing gained."
I don't think he sounds entitled at all. He gave it a shot, she said no. No one was rude in the situation.