Yeah it's a very nasty slur. Stormfront is a neo Nazi group. Prosecco Stormfront is used as a casual slur against MN specifically by certain types of smug left leaning people (1) . It's yet another tactic deployed to reject what women are saying without having to dirty their ears hearing what that actually is. Another way for them to lie to themselves that of course they'll listen to women, just not that sort of woman.
I'm sure the posters above don't know that or they wouldn't be taking it as lightheartedly but unfortunately it'll probably be taken by those of bad faith or limited thought as evidence MN is as awful as they think.
(1) who IMO should get their heads out of their arses and spend a few hours reading the relationship board and even AIBU to see just how common the everyday oppression and exploitation of women (the sex class) is, at all levels of society, right under their noses.