Couldn't tell you the exact percentage according to race for that vote down in Mississippi. But black folks have a lot of political power down there, and I imagine they would've been very vocal about the situation if they felt seriously offended, especially in the college town I lived in at the time. No reason for me to feel ashamed since I didn't claim black people necessarily supported the flag, just that they didn't turn out in large numbers to demand and vote that it be changed, yet they were presented with the opportunity to do so. Most folks down there didn't seem to care that much about the matter, from my observation.
Didn't answer your question about what they would be celebrating? Well, that's a subjective concern for each individual. Believe it or not, there are some black folks who drive around in pick-up trucks and sport the rebel flag as well. Might sound crazy, I know, but if you asked them they'd probably say it had more to do with the spirit of the Southland rather than zoning in on the racial history at the exclusion of all else. As your article discussed, there are regional differences in terms of culture, and plenty of people celebrate Southern culture, whether black or white, albeit in their own ways typically.
Reminds me of a book by Carol Stack titled Call To Home: African-Americans Reclaim The Rural South
. Has nothing to do with the confederate flag, but rather it's about how many of the black folks who migrated North wound up a generation or two down the line either returning to the South or sending their kids back to live with Southern relatives. The reasons having to do with economic conditions up North not proving to be as hoped for but also feeling more at home down South where there still existed a large rural black culture that held to traditions and old ways of life that the big cities up North were devoid of. So, matters of the heart and the community and a sense of rootedness. Lots of white folks feel in similar ways, race relations issues aside.
Not sure why you'd take issue with anything I've written here. You asked for people's viewpoints, so I offered mine. It's just one person's view of the situation, and I don't have any political clout. Can't claim to speak for others, but I can speak for myself. Take care.