ME AND MY COUSIN (Topic #Tiffany Haddish,#Katt Williams,#Red Grant,#kevin hart

Katt said Tiffany got famous off someone else's writing ... and ANYONE would have earned critical acclaim reading the "Girls Trip" script, which Katt claims he saw way back in 2004.

He added ... Tiffany's been in comedy since she was 16, but claims no one knows her jokes. Then there's this -- "She ain't done a tour yet. She ain't done a special. She has not proven the ability to tell jokes back-to-back for an hour to nobody."

For the record, Tiff has had specials and has a deal to do another for Netflix.

So, what's the secret to her success? According to Katt, it's just 2 words: Brad. Pitt. Watch ... he claims Tiffany's just playing the white card.

Harsh stuff. We'll see if Tiff fires back.

Katt Williams dropped by V-103 in Atlanta last week and had somefor comedian and actress Tiffany Haddish. "They all ready to down Mo'Nique and up somebody who has showed them Girls Trip. Did you think she wrote Girls Trip goofball?" he stated. He also claimed that the press only likes her because of her affiliation with white men. "She had a white husband for all of the 14 years she's been doing comedy and then all of a sudden divorced him. Then said he abused her. Then wrote a book.