The reports of the former couple rekindling their romance came out after they flew together to New York for Kanye West's Yeezy Season 3 fashion show, reported People magazine.
The 31-year-old "Keeping Up With The Kardashians" star took to Twitter to slam the reports.
"God forbid exes are cordial right. What is wrong with people. People should praise kindness. Not question it," she wrote.
Khloe recently split from boyfriend James Harden.