If you mess with the Longhorns, you get asked to change your attire.

During a Texas-BYU matchup on Saturday at the Marriott Center in Utah, some fans of the Cougars decided to throw some shade at the opposition with “Horns Down” shirts.

A group of fans — each wearing a letter to spell out the phrase — were sitting in the front row behind one of the baskets and near the Texas bench during the Cougars’ 84-72 win were asked to take off their shirts, KSL Sports first reported.

BYU coach Mike Pope expressed his disappointment in the fans’ actions after the game in his postgame press conference.

“That’s just not us,” Pope told reporters. “That’s not how we roll, just a miscalculation on a couple of eager kids — which we love the eagerness of these fans. But that’s not what we do here. … Just so you know, that’s not something we’re supporting.”

Per KSL sports, it was BYU personnel who asked the fans to remove the T-shirts.

The “horns down” phrase is the opposite of Texas’ popular “Hook ‘Em Horns” slogan and hand signal that Texas fans use, which has drawn the ire of the basketball team on at least one other occasion this year.

During a game earlier this month, UCF players celebrated their win over Texas with the “horns down” gesture, which incensed Longhorns head coach Rodney Terry.

“That’s classless!” Terry shouted as he made his way down the handshake line. “That’s classless! Don’t do that s–t! That’s classless!”

Terry elaborated during his press conference after that loss.

“I’m a big believer in you win the right way, you lose the right way. … You carry yourself the right way,” Terry said. “You don’t go through the handshake line, or prior to getting to the handshake line, and have about six or seven guys putting the horns down. We don’t do that.

“When you do those kind of things it looks very classless and it also looks like you were just hoping to win.”

Texas dropped to 14-6 with Saturday’s loss and 3-4 in Big 12 play.