For some reason, I can't reply to your last comment. Anyway, I did indeed say it's a disgusting thing, but if you were familiar with the situation, you might find it both appropriate and warranted. I did. What I found inappropriate was the droves of people on the right that ran for the hills apologizing all over themselves when this happened.
It's not always a reference to lynching. That sounds like liberal white guilt to me. What if the black guy happened to be a tyrant? What if, for example, someone hung Robert Mugabe in effigy? Would you say that's racist?