You can't argue with how someone else Feels, only with what makes them feel that way..
No stranger to reading a room, Stand-up Comedian Jimmy Carr once said, "If you're not laughing, you're learning," ..true even when 'not laughing' is paired with feigned shock and indignation..
Many leftists have an intense identification with the problems of groups that have an Image of being weak (women), defeated (American Indians), outcast (homosexuals) or otherwise inferior. The leftists themselves feel that these groups are inferior. They would never admit to themselves that they have such feelings, but it is precisely because they do see these groups as inferior that they identify with their problems. (We do not mean to suggest that women, Indians, homosexuals ARE inferior; we are only making a point about leftist psychology.)