A lot of people dislike Daniel Cormier because they prefer Jon Jones as a fighter.
A lot of people began to hate Daniel Cormier because of his rivalry with Jon Jones.
There are a lot of ugly moments with Jon Jones that Daniel Cormier lived. The two had a lot of moments that made fans hate them.
Alexander Gustafsson is another rival to Jones and Cormier who came very close to defeating them. However, a lot of hatred appeared when Jones fought Cormier instead of Gustafsson whom people saw more fit for the fight.
Daniel Cormier is a wrestler, which doesn't make his style very explosive. People prefer strikers with explosive power.
Despite all of the trash-talk, Cormier has never defeated Jon Jones, which makes his talk cheap despite all of his other accomplishments in the octagon.
Jon Jones was supposed to fight Anthony Johnson when he was pulled out due to his issues outside the Octagon. Cormier replaced him and defeated the fan-favorite Anthony Johnson.
When Cormier faced Alexander Gustafsson, he had a tough night despite coming out with a decision win. Gustafsson was the fan favorite that night.
Anderson Silva has for long been a fan-favorite. Defeating him made the fans hate DC even more, especially that he spent the fight wrestling him down.
Jon 'Bones' Jones never lost his title in a fight, which makes people think that Cormier is just keeping the belt warm for him.
When Cormier gets booed by the fans, he tells them to keep booing him. He is sarcastic, which makes a lot of people mad.
One of the reasons why Daniel Cormier is disliked by fans is because he's old and acts his age (38 years old), which doesn't make him appeal to the younger fans.