Yes Trump did say that Scots were celebrating leaving the EU. But Trump says a lot of things. Whenever he opens his mouth a whole heap of bovine excrement is sure to emerge.
Well, at least he didn't claim Scots were rapists, enemies of the American people, or celebrating 9/11. He's said that about our neighbors, our media, and our citizens, respectfully. As gauche as his Brexit comment was, the Scots got off easy.