I've gotten pretty good at ignoring/blocking trolls over the years.
FB has become a favorite place for old geezers to crap on each other.
About 5 years ago I started whittling down my "Friends List" to less than 100 because so many started ignoring/stopped caring about truth and facts and started getting so belligerent that keeping them around because a sort of self abuse.
I don't regret that all because things haven't gotten better since.