Tim McGraw is one ticked-off dad.

The country star took Kanye West to task after the rapper’s now infamous diss of country sweetie Taylor Swift on Sunday’s VMA Awards, telling CMT Insider the incident upset his daughters Gracie, 12, Maggie, 11, and Audrey, 7.

“He shows himself to be an idiot every time he does stuff like that,” said the country star, who also was the subject of Swift’s first hit single called “Tim McGraw.” “[My girls] were upset. But what he did do is provide a great example of how not to be, and my girls learned a big lesson.”

But, he added, “when they weren’t looking I said, “He needs an a– whoopin’!”

The interview with McGraw will air on CMT Insider Saturday, Sept. 19 at 1:30 p.m. ET/PT.