Demi Lovato was clearly not in on the joke on Thursday's "The X Factor" season finale!

The singer -- who has been extremely open about her past struggles with alcohol and drug abuse (and her newfound sobriety) -- could not conceal her frustration during a segment about her signature drink. 

Check out the clip above to see Demi's reaction when the show mocks her "annoying" tendencies!

"All season long, Simon [Cowell] has complained about Demi being annoying," Mario Lopez explained. "Maybe it has something to do with what she's been drinking at the judge's desk. Let's take a look."

Clearly, the "Skyscraper" singer was upset about the digitally altered clip ... which showed her drinking a suspicious green beverage. It even looks like she says, "that was f--ked up," in the middle of the segment. 

Do you think "The X Factor's" joke was inappropriate? Tell toofab in the comment section below! 

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