How would you handle this situation?

Alright, I'm boiling right now so I'm going to post here in hopes that I can get it out of my system rather than unload on my aunt/uncle.

My aunt and uncle post under the same Facebook account. It is often difficult to know who posted what, but everything that is posted is negative towards Hillary and democrats. They are ones that say that everything posted about trump is propaganda and shouldn't be posted, is biased and edited to make him look bad, etc.
But then they post all kinds of things that are untrue and nasty.

Not too long ago one of them (I assume uncle) posted three memes about Hillary that were very degrading, with the attempt to shame Hillary for Bill's cheating. I pointed out that many people stay with their husbands even after they have cheated, and there are many reasons why. And that it isn't fair to shame Hillary for Bill's behavior. After all, they have two daughters and five granddaughters. Would they be ok with people saying those things about them if their spouses cheated? One of their daughters is democrat and the other republican. Democrat posted something a few days later that basically told her feelings about those posts. Aunt/uncle came on and said that Hillary brought it on herself, and continued to defend the idea of shaming Hillary. I stated what I had before and others also backed up the dd. Aunt got mad, had a hair flip about "you democrats" and emailed me saying to stop attacking her on Facebook. What?! I had a response typed out but didn't end up sending it.

They continue to post nasty things about Hillary, democrats, and so on. I unfollowed them because I was sick of it, and they are not willing to use common sense or critical thinking before posting.

So, yesterday a friend posted the video of president Obama's speech when a trump supporter was there, along with Trump's misrepresentation of it. I liked the page and made a comment about trump living in an alternate universe. Today, aunt/uncle commented on it saying "of course if it's on the internet it must be true". I responded with more videos of the two speeches and encouraged them to do their own research. They responded that the videos are clearly edited to show what the person wanted it to. Agh!

I am fuming. First, because I am so sick of this blind trust in ridiculousness! Second, because I purposely unfollowed them so I didn't have to see their crap and now they are posting on my friends pages. Third, because she had the nerve to say I was attacking her but this has been a pattern for them.

These are people that, until the last 9 months, were very close family. I don't remember my aunt ever saying or doing anything mean or hurtful to anyone. At this point I don't know if I can ever have a respectful conversation with them again. They Have posted so many things that go against who I thought they were and I don't know if I can forget that.

So, would you address this with them? If so, how?