I think it was a mistake on his end to use the word, especially in PUBLIC. Though, I don't think anyone should freak out about this, for example I seen Skip Bayless say the Eagles should cut him. What a joke, Skip yet again being a moron.
Not sure if many people realize this, but the word is used very frequently especially among African American athletes in the locker room. Every football locker room I've been into you hear the word dropped casually like it's no big deal. Also don't get me wrong, I'm not saying it's OK to use the word, but lets not freak out because the MAJORITY of the NFL use the word. The word is VERY popular among the younger generation(15-30 years of age).