A moment of frustration has cost Collin Sexton a hefty chunk of change.  The Bulls guard was handed a $35,000 fine on Tuesday night for flipping off the hoop at Barclays Center during Chicago’s 123-115 loss to the Nets .  “Chicago Bulls guard Collin Sexton has been fined $35,000 for making an inappropriate gesture on the playing court,” the NBA announced in a release on Tuesday.  The gesture came in the third quarter after he missed a free-throw attempt before hitting his second shot from the