"Tbh I can't stand this girl," one user writes. "You don't ruin any family whether they're famous or not, but hating on her isn't gonna change her wanna be ways of being a hoe."
In an Instagram post showing dogs in a cage, in which Chloe asks her followers to sign a petition to shut down the Yulin Dog Meat Festival in China, the comments are also particularly harsh.
"B**ch u should be the one not the dogs since dogs have good heart and u don't," one commenter writes. "That should be you in the cage," another comment reads.
Still, Chloe does have her defenders.
"Woooah this is out of control. S**t happens," one user writes. "Scott is the main one to blame in this situation. I am a huge supporter of Kourtney but Scott has never been truly good for Kourtney and he is the one that was in the relationship with 3 kids. @chloebartoli is single and free to do as she pleases. Give the poor girl a break."
Kourtney, 36, and Scott, 32, have been dating since 2006. They have three children together -- Mason, 5, Penelope, 2, and Reign, six months. Scott has been spending an increasing amount of time with friends who "are not a good influence" on him and "not looking out for his best interests," a source tells ET about their split.