On Sunday (9 October), after the camera showed John Legend on the screen, it panned over to the reality TV star and SKIMS founder, who smiled, blew a kiss, and waved at fellow audience members, despite the loud hostile reception.
Fans of Kardashian wasted no time taking to Twitter to come to her defence.
One person wrote: "She had her child with her. People are just jealous."
"It's a shame they booed her with her son there! Grow up, people!" another agreed.
A third wrote: "Kim K is so sweet and nice, but incredible intelligent as well. It's their loss. Take Ye, he has controversy in the news; she wants to emotionally support him and sends a video of their kids singing his song. Then he comes back and talks trash about her."
Arrow star Stephen Amell also came to Kardashian's aid, noting that it's a "compliment" to be booed at a sports event.
\u201cKim Kardashian was just booed at SoFi Stadium during #Cowboys vs #Rams \ud83d\ude2c\n\nJohn Legend and \u201cSteve\u201d received a neutral response\u201d
"Kim Kardashian was just shown on the big screen and loudly booed at the Rams game. Being booed at a sporting event is a huge compliment. When people who don't know you think they dislike you, it means you are super duper famous," he wrote.
The Kardashian's star appeared unbothered by the booing and documented her NFL outing with her son Saint on her Instagram Stories.
The 6-year-old sported a Jalen Ramsey jersey and a matching hat, waved a yellow flag, and cheered during touchdowns as the Rams lost to the Dallas Cowboys 10-22.
Saint not only shared his support from the stands, but also got onto the field and saw the Rams' 2022 Super Bowl trophy.
Kardashian didn't appear to bring her and ex-husband Kanye West's other children — North, 9, Chicago, 4, and Psalm, 3 — to the game with Saint.