President Donald Trump recently used the term “sissy” in a way many would find offensive — and it represents an overall “disturbing” trend, one professor in public humanities said.

In a post on his Truth Social platform on Monday, the president unleashed his grievances about a new rule in the NFL that evidently has not been sitting well with him. He slammed the league for its “ridiculous looking new Kickoff Rule.”

“How can they make such a big and sweeping change so easily and quickly. It’s at least as dangerous as the ‘normal’ kickoff, and looks like hell,” he wrote. “The ball is moving, and the players are not, the exact opposite of what football is all about.”

″‘Sissy’ football is bad for America, and bad for the NFL!” he continued.

The NFL has implemented what it calls its new “dynamic kickoff rule,” which, among several changes, moves the kickoffs to the 35-yard line instead of the 30 and places players from both teams closer together to help eliminate high-speed collisions. The league has said its intention with the change was to improve safety for the players and to increase the rate of returns to make the game more exciting.