I've been struggling with this lately... I have an aunt who continuely sends me emails that are often loads of garbage and I don't agree at ALL with them. Lots of them are downright hate filled.
I have struggled with whether or not to email back about them, esp the ones that simply promote hate and ignorance.
I have decided to just delete ANYTHING she forwards me, before I even click it open. Often the title itself gets me worked up, but I just run for the delete button.
I truly want to just block her email all together, but decided that it's not worth hurt feelings.
It's hard, but more mature I think, to just hit delete when it's something in whcih neither party will win from arguing over.