Why is it ok for blacks to wear Mal X shirts but when whites wear Rebel Flags were raciest?

a href="http://news.yahoo.com/s/yblog_localdtw/20110304/ts_yblog_localdtw/kid-rocks-use-of-confederate-flag-sparks-naacp-boycott#mwpphu-container"http://news.yahoo.com/s/yblog_localdtw/2…/a