The outspoken American branded the former Spice Girl-turned fashion designer - who lives in Beverly Hills with her soccer star husband David and their three sons - "rude" and wants her to move back to the UK as soon as possible.
She told Closer magazine: "Victoria Beckham is so nasty. Why doesn't she just go home?! Her dresses are beautiful, but I don't care what she does. She's mean to all the people around her.
"She's too short to be a diva. We all use the same hairdressers, make-up artists, limo-drivers and greeters at the airports in LA and nobody has anything nice to say about her. They say she's rude. She can't always just be having a bad day."
The 76-year-old comedienne also blasted "vulgar" Victoria for her spending habits, insisting she should be less extravagant in the current difficult economic climate.
She said: "Victoria Beckham should get a life. I am not a fan of outrageous consumption. I think it is vulgar.
"And no-one should flaunt that they have a hundred Hermes £6,000 bags. Not when people are starving. Everyone should be allowed to have a great time but she shows a distinct lack of class."
This is not the first time Joan has hit out at the 35-year-old star and has previously called her "arrogant".
She said: "I dislike Victoria Beckham. The entitlement - the total entitlement. You want to say, 'Calm down, you were a Spice Girl.' The arrogance when she walks into a room is astonishing."
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