By Amber Goodhand - Breaking Celebrity News News Editor

Jack Osbourne isn't happy that NBC fired him and he's convinced he was fired for all the wrong reasons.

Jack's mom, Sharon, started the blast against NBC earlier this week when she resigned as a judge on America's Got Talent after seven seasons.

"I just can't be fake ... it's discrimination, and it was badly handled ... it's time to move on," the 59-year-old told the New York Post.

But NBC immediately released a statement on Tuesday stating that Jack wasn't fired because of his multiple sclerosis diagnosis in June, and that the network "does not discriminate on any basis."

Jack isn't buying it.

On Tuesday afternoon the 26-year-old tweeted, "NBC said they didn't fire me over my diagnosis? Bull-F**king-SH*T #BoycottNBC."

Jack was slated to appear on Stars Earn Stripes, a military-themed reality show featuring Dean Cain and Nick Lachey, according to Sharon, but producer David Hurwitz said the pact was never finalized.