Does it not go beyond just 'poor taste' though? Chris Rock has himself actually produced a documentary, Good Hair, with the description:
Honestly, I am not familiar with this documentary. Or if there is a history between Chris and Jada, I did see some comments earlier that lead me to believe that there is more to it beyond just the incident at the Oscars. Chris should apologize to Jada for the joke.
It's also pretty easy to hide demeaning commentary as a 'joke in poor taste.'
I agree, which makes it harder to determine a comics intention, e.g., one of my favorite comedians is Jim Jeffries, he made a lot of misogynistic jokes in some of his shows. Does he hate women? or does he just think it's funny to make those kinds of jokes? (He has toned them down over the years though as a result of backlash). My ex HATED him, but my current girlfriend really enjoys his shows.
It appears more difficult to find the line, I have autism (so does Jim Jeffries), so my interpretation of some issues is going to be different to others. I personally think that you should be able to joke about anything but the attitude towards the joke and intent is important to consider.
I completely understand the opposing view to this position though, or why jokes about minorities should only be made by someone in that minority group.
At the end of the day, I think that comedy is a tricky area to judge based on just the words that are used, intent and the general tone are very important.