There were some very good educational explanations on that thread for the open minded on that thread. Some people just don't WANT to understand (empathy seems in very short public supply at the moment), simlar non-stop winging occured in the 70's when "Naice white kids" had to share a classroom with those of other races.
Their parents were convinced they would be dragged down by the presence of brown skin, and not even reams of stats re exam results of the differing ethnicities would change their minds. Same narrow, predjudiced mindset, different target.
The earth keeps turning and we plod on.