A photo surfaced on Instagram over the weekend that showed 34-year-old Scott Disick and 19-year-old girlfriend Sofia Richie out with his three children.
Kendall made it clear that she didn't approve of their romance by commenting, "Awww Scott and his kids."
Many fans applauded Kendall for sticking up for her sister and Scott's baby mama Kourtney Kardashian. However, others called her out for being a hypocrite and pointed out that 38-year-old Kourtney is dating 24-year-old model Younes Bendjima.
Another chimed in that Kendall's 61-year-old mom Kris Jenner is dating 36-year-old Corey Gamble. "Isn't your mama with a guy almost 30 years younger than her?" the critic asked.