President Donald Trump’s comments about sports have been among the most bombastic of his time in office.He called NFL players who kneel during the national anthem in protest of racial injustice “sons of bitches” who needed to be “fired.” He implied that LeBron James isn’t smart.He often takes to Twitter to poke at leagues for low TV ratings. He recently lobbied for Big Ten football’s return.It seems no other president has so frequently weighed in on sports — at least not so derisively.“It is unusual,” said Fred Frommer, author of “You Gotta Have Heart,” a history of Washington baseball. “The c…