Jim Harbaugh couldn’t let it slide.

Last week, SEC personality Paul Finebaum went after Harbaugh in a way that in his mind, crossed the line. The Michigan coach was called a “cheater” by Finebaum after reportedly hiring Michael Johnson, the father of an elite 2019 quarterback, to coach for Michigan.

Finebaum claimed that Harbaugh had no reason to hire Johnson while leaving out the fact that he had spent a decade coaching in the NFL and was UCLA’s offensive coordinator and interim coach at one point.

So Harbaugh dropped a tweet that quickly went viral:

And as it turned out, Harbaugh was right. Michigan didn’t end up hiring Johnson because he accepted a receivers position at Oregon, which was even better than the position the Wolverines offered.

On his annual appearance on the “Tim Kawakami Show,” Harbaugh talked about why he reacted that way to Finebaum’s accusation.

“Come on, man,” Harbaugh said on the ‘Tim Kawakami Show.’ “I’m not going to just let that go.”

Admittedly, Harbaugh’s misuse of Finebaum’s first name was meant to be tongue in cheek.

“You try to take it with a grain of salt as they say and put some humor into it. But the annoying part is the people who show their true colors and try to impugn your integrity when you’ve done nothing wrong,” Harbaugh said. “They want to see you fail. They want to take shots at you. They say ‘no good deed goes unpunished,’ you hire somebody and what do they do?

“To impugning your integrity by calling you a cheater.”

Finebaum’s daily radio show is meant to push buttons, with regular outlandish call-in segments. Still, Finebaum certainly has a voice in the SEC community, and Harbaugh didn’t take too kindly to seeing his reputation slandered.

Finebaum’s criticism of Harbaugh likely won’t go anywhere — he called him the Donald Trump of college football last year — but now he knows he’s subject to the same Twitter shots that Harbaugh brought on the rest of the SEC.