LOS ANGELES: A furious Frank Stallone slammed the Academy in a foul-mouthed tirade Monday for snubbing big brother Sylvester in the best supporting actor category at this year’s Oscars.

The Rocky star was widely backed to bag the prize following a Golden Globe award for his critically acclaimed turn as the boxer in Ryan Coogler’s spin-off movie “Creed.”

But the statuette went instead to Britain’s Mark Rylance for “Bridge of Spies,” in one of the biggest shocks of Sunday’s gala ceremony at Hollywood’s Dolby Theatre.

“The Academy should be ashamed of themselves. It’s as clear as the nose on your face that Sly won. Mark who? It’s total Hollywood bullshit,” tweeted livid actor and musician Frank, 65.

Stallone himself was in more magnanimous mood, posting a picture of himself on Instagram in his black and blue Oscar tuxedo winking at the camera, fist clenched in defiance.

“To all the ‘real Rocky’s’ of the world, Please hang on to your dreams, NEVER GIVE IN , NEVER GIVE OUT , NEVER GIVE UP! thanks for the support,” said the 69-year-old, who was last Oscar-nominated 39 years ago as best lead actor and writer for “Rocky.”