Olympic superstar Ryan Lochte says he was genetically-engineered to kick ass on "Dancing with the Stars" -- telling TMZ Live ... it's in his DNA to compete ... but that's just ONE of the many reasons he wants to do the show. And, think "midget wrestling" is offensive? We talk to the little person who country star Zac Brown bowled a strike with ... and he adamantly disagrees ... you gotta hear why. Plus, is Nivea out of its mind for dropping Rihanna for being too sexual? Some people in newsroom actually agree with the ballsy move.