Publicly insulting one of your biggest customers is not taught in business school, but Elon Musk is not one to let convention get in the way of a good flame war.

SpaceX has urged the U.S. to address trade barriers affecting its Starlink satellite communications service in foreign countries, arguing that competitors from abroad face no import costs in the country.

Tesla warned of the hit to its bottom line from tariffs, while SpaceX complained that foreign trade barriers affect its Starlink internet satellite service.