Had that reaction today at work - lost my male black pastel last night for some reason. I managed to keep my mouth sealed and not respond.
Not everyone understands we don't need wagging tails or furry cuddles to love our animals - their loss.
That is a show of strength imo. That you didn't respond. I wish I had the self-control and humility that you do, because I would have ripped into them like a maniac.. lol, that is why I am not on Facebook I suppose.