Travis Barker, 45, brushed off a diss from girlfriend Kourtney Kardashian’s ex-boyfriend Scott Disick, 38, on August 31, and now we know why the drummer seemed unfazed by Scott’s shady direct messages with Kourtney’s other ex, Younes Bendjima. HollywoodLife has EXCLUSIVELY learned from a number of sources that Travis didn’t care about Scott taking jabs at his PDA with Kourtney because he doesn’t “feel threatened” by Scott or fear that Kourtney will one day want him back.