Frankly, there's not much I can say about this.
These are the people who attacked us 11 years ago today, and we clearly have not learned 2 lessons in that time: first, their grievances are bulls*** - nothing more than hastily fabricated excuses to riot. One day it's an offensive movie, the next day it's U.S. troops in the Arabian Peninsula. They're not concerned with consistency in their complaints and we shouldn't be either.
This is an absolutely gutless response on the part of an American envoy, and Ambassador Patterson's career should come to a swift end as a result.