It's sports, fella. Euros wants to see European boxers kick the ass of American boxers and yanks want to see American boxers kick the ass of European boxers. It's just part of the entertainment. Some Afro-American boxing fans likes to translate this into white wants to see white boxers kick the ass of black boxers, but I think nationality matters more. As for Green, he talks big, gets beaten and makes excuses. Repeat. Of course fans will get annoyed.
I'm pretty sure most in the states expected and looked forward to Kessler ko'ing Green. Some of us are fans of the sport first.
If a fight ensues explain to Green that you'll be doing the RBR with your left hand and fighting him with the right.