During the recent White House meeting between the two leaders Trump very visibly ignored Merkel’s offer of a handshake. In Business Insider's video a room of photographers encourages them to shake hands, the German chancellor offers him to do so. He ignores her with a smirk on his face that leaves Merkel bemused. Considering the emphasis of his theatrical handshakes with other world leaders, its absence with the German leader stands out all the more.
Politicians are people too and sometimes their motives are very human. When the US president got elected Merkel gave a carefully-worded speech that committed herself to the two countries’ alliance based on the values of respecting all people “independent of origin, skin colour, religion, gender, sexual orientation, or political views.” It was a subtle, yet well covered, dig at Trump’s not so inclusive campaign rhetoric. This in addition to Merkel expressing her support for Trump's opponent, Hillary Clinton prior to the election.