"Happy white peoples independence day the slaves weren't free but I'm sure they enjoyed fireworks"
It doesn't matter how far we have come from the past, there will always be those who want to throw it in your face. Sort of like a girlfriend who never forgets the things you have said and done, no matter how much time has passed, and will throw those things out at every opportunity.
What kind of amazes me though, in what other country can a black, high school dropout, racist become a multi-millionaire by telling stupid jokes?
None. In most other countries, a man of his particular talents would be picking some type of produce or have a career in some in one of the service industries, food, hotel, etc.
Why is it that people like chris rock can't be thankful for the opportunities this Country has provided them? I'm willing to bet that he worked very hard to get where he is. Why can't he try to instill those values on others?