By Daniel Bates Coach K may be done on the sideline, but he still find ways to scratch that competitive itch in retirement. Over the weekend, the former Duke men’s basketball coach was spotted at the casino playing some $100 slots. Fans reacted to the Coach K enjoying his time away on social media. “North Carolina you’ve broken him,” one user replied. “What kind of weirdo films this,” another said. “Oh my God he really is retired,” commented USA Today’s Dan Wolken. “Coach K is going #Degen mode in retirement.” “No hello? No hey coach? Just straight camera to the face. Wish Coach K had knocked …