Society has broken down.
Since people believe there should be no rules and we keep allowing more and more things as 'normal' that are clearly abnormal.. you have the scumbags who indulge their fukced up impulses out of the same misguided idea that rules are not for them.
So in this case, punching another person from the blind side who isn't attacking you is traditionally considered out of bounds. Punching a female of any kind. Punching an older person of any kind. And especially for Black men: punching an older Black woman. Sucker punch too. Not even squaring up.
This cannot be allowed in our civilization. May Karma find him. Rapidly.