"In a heated moment, I decided to greet hate with hate," Kelce said before ESPN's broadcast of the Buccaneers-Chiefs game featuring his brother, Kansas City tight end Travis Kelce. "I fell short this week."
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Jason Kelce was attending the Big Ten matchup between the Buckeyes and Nittany Lions in State College, Pennsylvania, when the incident occurred. Video on social media showed him walking through a crowd near Beaver Stadium and fans asking for photos and fist bumps when one fan began to heckle him.
At that point, Kelce grabbed the fan's phone and threw it to the ground, then turned to confront the man dressed in Penn State attire. Another fan appeared to step between them before the altercation could escalate.
"I think everybody has seen on social media what happened this week," Kelce said on the ESPN broadcast. "Listen, I'm not happy with anything that took place. I'm not proud of it. In a heated moment I chose to greet hate with hate and I just don't think that's a productive thing, I really don't. I don't think it leads to discourse and it's the right way to go about things. In that moment I fell down to a level that I shouldn't have.
"The bottom line is, I try to live my life by the golden rule, that's what I've always been taught," he said. "I try to treat people with common decency and respect, and I'm going to keep doing that moving forward."
The Associated Press contributed to this report.