In the "Keeping Up With The Kardashians" June 29 episode sneak peek, Kim Kardashian and Kris Jenner told Khloe about the racial slur given to Kmye's daughter North West while in a first-class cabin.

"I fell asleep, I woke up to this woman screaming, 'Kanye West's baby!"' Kim told her sister while sitting in the kitchen. "The woman is screaming at my child, I jump up."

"I would've punched her in her face," Khloe chimed in.

"No, we were on a plane. I wanted to," Kim replied.

"I would've," Khloe insisted.

Their mother then continued how the racial slur incident took place. "This lady stood up in the cabin in first class and yelled at the top of her lungs, 'She's with a black guy, and that baby is black!"

Kris revealed when North started to cry, the lady yelled, "And you need to shut that black baby up!"

"I would say, hashtag, 'I only like black c---!' That's what I would say!" Khloe responded.

While they are known for being active in social networking sites, the Kardashians did not share about the incident until recently as they are apparently saving it for their reality show, according to Guardian Liberty Voice.

In May, Kim wrote a blog about her views on racism and how motherhood changed her. however, she was criticized for admitting she had not given "racism or discrimination a lot of thought" until it affected her in the essay, Daily Mail has learned.

Kim wrote, "To be honest, before I had North, I never really gave racism or discrimination a lot of thought. It is obviously a topic that Kanye is passionate about, but I guess it was easier for me to believe that it was someone else's battle. But recently, I've read and personally experienced some incidents that have sickened me and made me take notice. I realize that racism and discrimination are still alive, and just as hateful and deadly as they ever have been."

"I feel a responsibility as a mother, a public figure, a human being, to do what I can to make sure that not only my child, but all children, don't have to grow up in a world where they are judged by the color of their skin, or their gender, or their sexual orientation. I want my daughter growing up in a world where love for one another is the most important thing," she added.

In February, Kim also experienced a racist attack when she was approached by a man in blackface pretending to be Kanye West during the Vienna Ball, which she attended as the date of 81-year-old billionaire host Richard Luger, Hollywood Life reported.