I actually think hair for most women - whether they are black, Indian, Chinese or white - is very important, and whether long or short hair, thin, curly, frizzy; a woman's hair is still very important.
That said, even older men going bald can be very sensisitve, even though this is very common in men.
So, yes, i agree the supposed 'joke' should not have been said.
However, violence is not the solution, and at the Oscars even less so.
Basically, it possibly spoilt the event for many other Oscar attendees, whether winners or contenders.
Chris Rock showed remarkable fortitude in recovering and continuing his presentation.