They’re not exactly mainstream, either; I stated the mainstream press is billionaire owned.

As for the insults, they don’t come from nowhere; Mediapart has been wishy-washy on upholding their own journalistic rigour when it comes to reporting on LFI precisely when much of the media landscape is actively hostile towards them. For example, the media observatory ACRIMED has written about it last year as part of a broader article on this hostility: https://www.acrimed.org/Ce-que-nous-dit-l-acharnement-mediatique-contre