Paul Rudd befriended a 12-year-old boy whose classmates refused to sign his yearbook

• Paul Rudd befriended a 12-year-old whose classmates wouldn't sign his yearbook.
• "It's important to remember that even when life is tough that things get better," Rudd's note read.

Paul Rudd befriended a boy whose classmates refused to sign his yearbook, CNN reported.

Twelve-year-old Brody Ridder only had two peers and two teachers sign his yearbook, according to his mom Cassandra Ridder's viral Facebook post.

"My poor son. Doesn't seem like it's getting any better. 2 teachers and a total of 2 students wrote in his yearbook. Despite Brody asking all kinds of kids to sign it," Cassandra, who is based in Westminster, Colorado, wrote in the post. "So Brody took it upon himself to write to himself. My heart is shattered. Teach your kids kindness."

Brody's note to himself read: "Hope you make some more friends -- Brody Ridder."

His experience made the news because the next day, older students at his school lined up to sign his yearbook, according to the "Today" show. Per Today, Rudd saw the story and learned that Brody's favorite superhero was Ant-Man, the character Rudd plays in the Marvel Cinematic Universe. So, he reached out to Brody for a FaceTime call that his mom captured for Instagram.

"I'm very excited that I get to talk to you and I get to meet you," Rudd told Brody in the clip.

Rudd followed up the call with a personal note and a signed Ant-Man helmet, Cassandra shared on Facebook. Plus, the two text now.

"It's important to remember that even when life is tough that things get better," Rudd's note read in part.

"There are so many people that love you and think you're the coolest kid there is," he continued, noting that he is now among Brody's admirers.

"Parents need to teach their children kindness, open up that dialogue," Cassandra told NPR, reflecting on her son's experience. "And if you see your child being mean to somebody else, talk to them about how that could possibly make them feel. Talk to them about intent versus impact."

The Ridders and representatives for Rudd didn't immediately respond to Insider's request for comment.