DISINTERESTED OR UNINTERESTED!!!!

The other day I was on Kolkata bound train. As usual discussion initiated by a fellow passenger. In a short journey, if you get involved in a discussion , then you will never realize when the journey comes to an end. But if it is otherwise the journey seems so long!
The same happened on that day. When one of the fellow passengers dropped a topic from politics, and other passenger, looking quite elite, turned his face and replied sternly- I’m disinterested in politics.

Disinterested? Or uninterested?

I couldn’t gather my guts to rectify his error. After all he was looking so confident. But you need to be cautious.

Disinterested – having no personal involvement or receiving no personal advantage, and therefore free to act fairly. “Impartial” or “not taking sides”.
“All good referees must be disinterested”

Uninterested – means not showing any interest. “Not interested”.
“I’m uninterested in books. I’m interested in movies.”