When President Trump is ready to let the world know that he is disappointed with the intelligence community, the United States judiciary, individual journalists, department stores or whatever else lands on his radar, he uses Twitter to blast his targets.

It was only a matter of time until his supporters adopted his style.

“I voted for you but you’re still acting like a baby,” one supporter from North Carolina wrote on Sunday, the same day Mr. Trump insulted the billionaire Mark Cuban by saying that he was ‘‘not smart enough to run for president.’’

“When are you going to act Presidential???” wrote another supporter in Arizona that day. “Not every thought needs tweeting.”

“I voted for you but this is embarrassing,” someone else wrote last week, responding to the president’s tweet attacking the department store Nordstrom.