I've had the same thing happen to me. A simple share, without comment or expressed opinion and boom out of left field. Wasn't even political. Another time I took a pic of my son who won a fish in a bowl at a birthday party---I didn't even pay for the blasted thing and you'd have thought I posted torture photos. I get it...why not attack the person who supplied the fish in the first place?? Same family.
And when you do find out exactly how it is that we "teach" people how to treat us, I'd really like to know the wisdom and true intent and context. Is it an "absolute"?
Sharing in your frustration.