I get both sides of the discussion. I understand how a person who is passionate about what he does can respond this way, if he is an emotional person. I do not think it is appropriate to behave that way in public, but I can see how it could happen.
I personally don't care for the personal boasting comments stating that he is the best cornerback, and belittling another player. However, I feel the same way about Crabtree's responses back to Sherman. This unfortunately is part of sports and is the definition of unsportsmanship.