The Diaz brothers seem to get some degree of social anxiety any time they are in public. Fighting Conor is, like he says, a whole different ball game that many of these guys are not ready for. That's really not the Diaz bros elment despite how funny they are.
If Diaz can make it through the first few minutes I think he'll gain some mental strength, but he's definitely going to be a little shook, IMO, during the first few minutes of that fight given the insane magnitude of it vs his regular fight.