You are correct but some people don't understand that society has changed and it is no longer acceptable behavior. It may even have been done innocently and quite humorous but in the same way that certain words used to be used by many are no longer acceptable. In simple terms, it is no longer acceptable to subject any persons of different ethnicity or persons with different sexual preferences or persons with disabilities, etc to be ridiculed. You may prefer it the way it was 20 years ago, but times have changed.
The people who are now in trouble are those who observed the ridicule by Incognito and buddy but did not report it, or if they did, those who did nothing about it. It doesn't matter if it was meant to be funny and boys just being boys, the rules of the game have changed and unfortunately, the Miami Dolphins happens to be in the spotlight. Every team GM is probably saying - "there but for the grace of god, goes us..."