Yes when Team Alpha Male humiliated, destroyed, and took Barao's belt all in one night. Pre-fight banter with Pettis is completely different. He didnt just steal Pettis' belt, and kick his ass in a one sided beat down. Like I said, they are sore winners.
Why do you think Ronda got so much hate after denying a handshake from Meisha? Because after a fight the trash talk stops and people focus on their next opponent or celebrate their victory in humility.
What if I beat the fuck outta your friend in a fair 1v1 fight, and then afterwords told the entire world how shitty he was? Or if I beat the fuck outta your friend, say good fight and end it at that. There is clearly a difference. You can talk shit all you want pre-fight. Its classless to spit on your opponent after you beat him down. Its called adding insult to injury, and only losers do that.