By Gautam Varier Charles Barkley has once again been taking shots at the Golden State Warriors and Klay Thompson isn’t too happy about it. After the Warriors lost to the Oklahoma City Thunder on Friday night, Klay fired back at Barkley. “The only frustration with that is will this guy ever give us any credit?” Thompson said. “You know how hard this is to do? Annually? You’d think Charles would understand how hard it is to win a championship. To do that annually? And we’re still here. What are we — 10 and 12? There’s 60 freaking regular season games left. But he’s been hating on us since 2015. …