DeBoer issued a warning to fans following Saturday's fight inside Bulldog Stadium.
The brawl lasted several minutes and spilled out of the stands and into the concrete concourse below.
Boise State would go on to dominate the Bulldogs but after the game, many took to social media to watch the fight unfold.
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Videos of the violent scene have since gone viral.
"We just got to be smarter and understand that's not going to be accepted here, that's not what we stand for," said DeBoer.
Several videos posted to social media showed punches being thrown in the north endzone bleachers.
Our own Action News camera caught one of the men swinging at Fresno police officers as they tried breaking up the fight.
Fresno State Police would not talk to us on camera but did say multiple people were arrested Saturday night for their involvement in the brawl.
Coach DeBoer was left to answer questions about the incident during his weekly press conference Monday.
"Ninety-nine percent of who was in the stadium, more than that probably, came here for sheer entertainment," he said. "We really don't want you here if that's what you're coming for."
Armando Gonzalez, an eyewitness, caught about six minutes of video of the fight on his cell phone.
"Sold out crowd, a lot of alcohol, a lot of fighting going on after halftime," Gonzalez said.
Alcohol was banned from Bulldog Stadium in 2006 but allowed back in 2017.