I view extremes, in the context of political leanings, as being positions that do not allow for new or competing information. Holding on to a position at any cost, despite evidence of the contrary.
I can "define my terms" for you, but would that really change anything?
I just thought it was a bit funny to see so many replies to such a one-off and throwaway comment.
I do want to know though... is it that everyone thinks I'm a troll? I'm not familiar with this particular instance overall, but I'm not a stranger to general socialist content. I figured it would be understood that "extremes" would refer to political ideology that involves sticking with a party at any cost, without ever thinking critically about the ideology and their positions.
I hope this clears it up for you.