One of Donald Trump’s blustery campaign promises was “if I’m president, you’re going to see Merry Christmas in department stores again, believe me.” A slap at Christophobes, it was typical of his politically incorrect comments on everything from feminism to climate change, terrorism to refugees. With President Trump setting the tone, writes Nigel Hannaford, the public square will become a much noisier, ruder and freer place.