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George Pickens just wrote another chapter in his "Book of Deleted Instagram Disses" -- this time, the Cowboys receiver ripped into ex-NFLer Richard Sherman for comments made on "Thursday Night Football."

Just a week after Pickens set his sights on Philadelphia and Eagles fans and said they're only good for sandwiches, the 24-year-old athlete shifted focus to the Prime Video analyst.

Sherman criticized Pickens for seeming "uninterested" and giving a "half-assed" performance in CeeDee Lamb 's absence after the loss to the Detroit Lions ... something, he said, simply can't happen if No. 3 wants to be the best in the NFL.

Pickens -- who had five catches for 37 yards in the 44-30 L -- got wind of the Super Bowl champ's evaluation ... and fired off an unfiltered response on In

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