The reason why quite many mention the unsportmanlike behaviour is that the title was already lost in Brazil and in Abu Dhabi Hamilton's title was already only mathematically possible. Why mathematically? If you are in a very dominant team and a bad race weekend could mean finishing third, then to hope that your team mate finishes somewhere else besides the podium is already clenching to the very last straws.

About preferring one driver to the other. Wouldn't you tend to be more supportive of a team player?

For me Hamilton is the sorest loser I've seen. Like I already mentioned, the chances of Nico losing the title were mathematical, then if you want to show that you are the better driver and you should had won it ... then you do a pure power demonstration and if possible even lap your team mate. Not slow down.

In reality, there will always be people who will say that Hamilton was sabotaged or sth and he should had won the title because he was the faster driver...