The organization released a statement denying their involvement in the incident, but Christina Cho, the flour-wielding perpetrator, has frequently staged anti-fur protests for them.
"I've been a vocal supporter of PETA for a long time but I have also been very vocal about anti-bullying, so this was a huge disappointment for me," wrote Khloe on her blog. "As you all know, I don't condone violence and bullying and what happened last Thursday was just that."
In 2008, the reality star was featured in PETA's "Fur? I'd Rather Go Naked" campaign.
Khloe concluded that while she is still anti-fur, she will no longer suport the animal rights organization.
"Bullying and harassment is NEVER a solution," she wrote, "and I won't be a part of any organization that thinks otherwise."