“Saturday Night Live” lost a fan in Amy Lou Wood after the sketch show poked fun at her HBO series “The White Lotus” over the weekend. In a series of posts shared to Instagram, Wood slammed the segment, which included a visual gag making fun of her teeth, as “mean and unfunny.”

The sketch in question, called “The White Potus,” featured Jon Hamm playing Robert F. Kennedy Jr. and Sarah Sherman as a riff on Wood’s character Chelsea. On the series, which aired its Season 3 finale last week, Chelsea is partnered with Walton Goggins’ Rick; here, Chelsea is partnered with Rfk Jr. As Hamm’s Rfk Jr. rails against fluoride in water to Sherman, who plays his girlfriend, the actress responds in a British accent (Wood is from Manchester). More notably, Sherman was wearing an exaggerated tooth prosthetic — an attempt at mocking Wood’s own teeth.

“I did find...