I'm telling you Georges' response in case you missed past interviews. He told Ariel on the MMA hour that he would rather move up and fight Bisping at 185lbs because #1) they are tied for most wins in the UFC and #2) he beat several guys who beat Robbie...4 of them...Jake Shields, Johny Hendricks, Jason Miller and Nick Diaz. What would he gain by beating a guy that lost to 4 people Georges beat? As opposed to winning a title in another weight division.
Additionally, Robbie didn't grab a mike and call out Georges. GSP doesn't take well to that. Please refer back to when Nick grabbed the Mike and declared to the world on live PPV that Georges was running.
Tyron after the fight, in front of the entire MMA press corps said he wants Nick or Georges. GSP said "Yes" twice. So, he was just waiting for someone to ask!