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On the same day ESPN's Skip Bayless called him a "liar" and "an alcoholic," Johnny Manziel decided to stay home by himself and read a book.

Just kidding ... he totally went out and partied in Miami.

Manziel hit up FDR at the Delano Hotel where he clubbed alongside Victor Cruz, Ryan Phillippe, and Maverick Carter. We're told Manziel asked fellow partiers not to take any pics while he was kicking it in the club.

That didn't stop Miami club queen Julz from posting a vid of Johnny Football giving LeBron James a happy birthday shout out.

Odd that Johnny hit the club just hours after Bayless called him out -- and Johnny himself promised to be more responsible as a pro football player.