The problem with Robert De Niro’s using the F-word against President Trump isn’t the word itself — it’s the absence of underlying content.

Indeed, even Trump himself seems a bit confused by the meaning of De Niro’s weekend outburst. As if it the actor hadn’t reached a wide enough audience, the president decided to weigh in while flying back from his Singapore meeting with North Korean leader Kim Jong Un. “Robert De Niro, a very Low IQ individual, has received too many shots to the head by real boxers in movies. I watched him last night and truly believe he may be ‘punch-drunk.’ ”

Punch-drunk, or maybe just missing the mark. The Academy Award-winner dropped the F-bomb onstage during Sunday night’s Tony Awards, where he was supposed to be introducing equally famous singer Bruce Springsteen. Veering off-script, De Niro declared: “I’m going to say one thing, F— Trump.” He doubled down. “It’s no longer down with Trump. It’s f— Trump.