Elon Musk’s comeback to Justin Trudeau‘s post is grabbing everyone’s attention. What is raising everyone’s eyebrows is that the Tesla CEO comedically called the ex-Canadian Prime Minister “Girl” in their interaction.

Elon Musk has told Justin Trudeau he “doesn’t matter” after the outgoing Canadian prime minister dismissed Donald Trump’s plan for the U.S. to take over its northern neighbor. The key adviser to the president-elect jabbed Trudeau on his X social media platform (formerly Twitter) after Canada’s premier announced Monday he is to resign.

As a giant of industry and the world’s richest man, Elon Musk wields influence across the global economy. He’s leveraging that success to extend his influence into the democratic process in Canada and elsewhere.