As NathanE said, while you could put today down to poor judgement, there are other examples of when he has clearly had the red mist descend and deliberately moved into another driver.
Combine that with his ban and the supposed bribe in Monaco, and the questionable money that is funding his paid seat in F1, and all in all he is a very unlikeable package.
This. I also believe he dislikes Hamilton on a personal level. Perhaps because he is British, or dare I say the other thing...
The guy just radiates supreme levels of uncontrolled jealously, arrogance and aggression.