How Sarah Palin really acts

From TMZ

Sarah Palin has no love for the daddy of her grandson ... because she just barked out to TMZ that Levi Johnston is a 'deadbeat dad.'

As TMZ previously reported, Levi just filed legal docs asking for 50/50 joint custody of 4-year-old Tripp.  He says it's in the boy's best interest.

As for whether Levi should get joint custody ... Palin is incredulous.

But here's the rub ... Levi is roughly $66k behind in child support.

Palin's disdain for Levi is palpable.  Watch the video ... you'll see.

I'm a little confused, first Levi wanted full custody, now just joint?  Oh well this video shows Palin at her bitchiest.  She better watch her mouth, the judge in Molly and Mike's divorce trail told her and Todd to zip it regarding Mike or Molly would lose custody and get supervised visitation.