With the exception of Merkel, Trump gets along with other world leaders;  he has particularly close relationships with May, Abe, Macron, and Duda ( possibly Putin as well?)

Merkel is truly the odd woman out here.  Merkel and most Germans despise Trump because of his wealth, boorishness, and political incorrectness.

Trump returns the favor by pointing out that the Germans under Merkel's leadership are complete feckless NATO deadbeats who cannot field even one armored division because they expect Americans to provide for their security while they ship BMWs tax-free to the US from their Mexican plants.

Trump and Merkel also clash on the issues of immigration and the Paris Accord.  Merkel has effectively removed border controls to make Germany a non-national state and she is adamant that climate change will somehow be improved by a treaty with no enforcement provisions.

The British and most Europeans cannot stand Merkel either.  Trump is in good company.