Diaz is the trashiest talker in the game. He's so deep into it and genuine with it that nothing Conor could say would hurt him. Diaz doesn't get hindered by overtraining, he never looks meek, always like a thug out of Stockton. Conor on the other hand looks meek all the time and his talk isn't genuine. He legitimately looks like he doesn't feel like talking trash all the time. Look at that finger. That finger will haunt Conor's dreams. On fight night you can see here Diaz isn't intimidated at all and Cerrone has no idea how to take this so he just nods. Conor would try to laugh it off, but Conor's a smart guy and knows Diaz has legit long boxing meaning Conor couldn't employ his usual rangy fighting tactics. In the fight against Johnson, Diaz never let Johnson get in range for a left hook. Conor would know about this disadvantage in range and that his style isn't good against rangy guys like Diaz. This is what will be in Conor's mind. And so in his mind he would be thinking this and his smile wouldn't be legitimate. Diaz would give him the finger and Conor would know that his time is up.