Levi Johnston Appalled By Bristol Palin's Parenting

Could a temper tantrum on Bristol Palin's reality show, Life's a Tripp, cost her custody of her son? 

"I hate you!" yelled 3-year-old Tripp.

Tripp talked back, took a swing at his mom, and even dropped the F-bomb!

"Go away you [expletive]!" said Tripp.

"What did you just say?" said Palin.

Palin reacted by giggling.

"I can't believe you just said that," said Palin.

Now, Tripp's dad, Levi Johnston says he's disgusted by Palin's parenting skills, and he plans to sue for custody.

"I want full or half custody of Tripp. His room is already set up in my house and just waiting for him. He deserves a better family," said Johnston.

Johnston, who is expecting his second child with his girlfriend Sunny Oglesby, says that Tripp has "no real parenting" and that his son is on a "downward spiral."

But Palin is striking back. The single mom told Good Morning America that Tripp is a typical precocious 3-year-old, and she's doing her best.

"He's going to say what he's going to say. I don't approve of him talking like that, and I'm working on my discipline," said Palin.