Farrah Abraham Says She'll 'Never Speak' To Catelynn Lowell Again After 'Dying Horse' Sex Tape Diss

"It's either jealousy or immaturity."

That's how XXX Teen Mom Farrah Abraham is rationalizing the monumental diss that was delivered to her by her MTV costar, Catelynn Lowell.

Catelynn -- who infamously put her Teen Mom kid up for adoption back in 2008 -- took to Twitter to suggest Abraham, 21, sounded like a "dying horse" in her just released skin flick, Farrah Superstar: Backdoor Teen Mom.

"All I have to say is she sounds like a dying horse!!," the reality star wrote.

Now, in a new interview, Farrah is responding to the verbal jousting and suggesting that Catelynn is misunderstood about her decision to sell the sex tape to Vivid, for $1.5 million.

"I feel like if she was in the position I was in and she like knew me... I don't understand why she would say what she said," Farrah told HollywoodLife .

"It's either jealousy or immaturity, but I don't understand why at this point and time she would say that. I'm just moving on and not talking to people who don't support me."