Nick Diaz was inside 1 Oak nightclub when Conor McGregor went off on Floyd Mayweather Tuesday night -- and had this 2 word reaction -- "F*** you."
Diaz began Snapchatting himself during Conor's rant -- and said, "I was already the 2-weight world champion, bitch."
Then he threw up a middle finger and said, "F*** you."
Our Diaz sources tell us Nick wants a piece of the Irish superstar at some point in the future ... though no word if there's been any real talks behind the scenes.
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