Trump Ignores Angela Merkel's Request To Shake Hands, What Does This Indicate?

A blunt display of arrogance or childishness?

As a gesture of greeting dimplomatic or ministerial guests, it is customary to shake each other's hands when offered. But, for US President Donald Trump there are no norms or customs. In a departure from the traditional gesture of greeting and interacting, Trump on March 17, 2017, ignored Angela Merkel's request to shake hands with her at the White House. 

It is important to know that Trump's antagonizing gesture has a root in the past and in Merkel's completely divergent opinions and policies over immigration issue.