I hate cockiness in general (not just in athletes). If they're humble and just do their thing I'll cheer for them and feel for them when they fail. If they're a cocky sob, I'll never cheer for them and, while not happy that they fail, I will find it hard to show any empathy.
Don't get me wrong, I enjoy some emotion from the players, just not the douchery of proclaiming to the Blazers crowd "I'm back!" or the statement from Draymond after the game. Celebrating a made shot, yelling in excitement, celebrating with your teammates, etc. are things that I'm totally fine with.
The Georges Niang situation with the Hawks is different. There was clearly some animosity with their fanbase over some twitter incidents and I couldn't say that Georges was particularly disrespectful or cocky to other teams outside of the Hawks, so I'm cool with that.