I honestly don't see how people can interperate Jones as cocky for a few small comments and incidents.
He didn't shake hands with Matyushenko. He later apologized to Matyushenko personally and has said that people don't give V-Mat enough respect, and that he should be considered a legend (which I find debateable, but still...)
He responded with the "three strike" comment to Aaron Simpson by telling him to focus on his own opponent while reminding him of the three strike rule. When asked about Bader, he always talked of him as a worthy opponent.
He got into it with Brandon Vera at the weigh ins. Vera talked all kinds of trash about Jones, and Jones apologized for it afterwards. Vera continues to trash Jones to this day after taking that phobia-inducing elbow.
Is Jones maybe a bit emotional? Yeah, but he's young. He's adjusting to everything right now, and I'm sure he'll figure out how it all works, just like GSP.