To be fair, neither your Grandad nor mine, who died in 2008, would have known what Facebook was, so better to leave them in blissful ignorance.
My Grandad fought against the Nazis and was a POW for the best part of four years, so it's fair to say he wasn't in favour of racism, but neither would he support his efforts being twisted in the other direction by a bunch of Marxists as a means of suppressing free speech. Somewhere between these warped, extreme philosophies lies a genuinely tolerant world where people can express their own opinion and accept the right of others to do the same, even if the cost is to find a small minority of those opinions uncomfortable or offensive on occasion.