To Ms. Roitfeld, those models stand in for a type. “I know this woman very well — I grew up around her,” said Ms. Roitfeld, who was reared in an affluent suburb of Paris. Wryly, she added: “This woman doesn’t have enough money to shop at Hermès, so she goes to Celine. She is not very nice to her maid.”

Sending her up is the kind of brash move that once sealed Ms. Roitfeld’s reputation. But as superstar editors go, she is one of the last in a vanishing breed. The 1980s and early ’ 90s witnessed the advent of the celebrity editor, Anna Wintour of Vogue and Franca Sozzani of Italian Vogue among them. Today they are all but extinct, much of their authority ceded to cadres of chattering influencers.

“On Instagram, these people say what they want, show what they want, without any culture or judgment,” Ms. Roitfeld said. They are far too busy airing platitudes that, she said, “travel like fire on the web.”

“ There will be no more Francas, no more Annas,” she said with stony finality. “Fashion has finished that chapter.”