Not so much a peeve as a hilarious thing to point out that I have yet to see an answer to beyond "LOL" and "You're clueless". I'll probably find something else to harp on once somebody makes even a half-hearted effort at rebutting it. Fascism pretty much died out except as an insult, while liberalism stuck around and changed, which is why I consider it legitimate to use the historical definition of one and the current definition of the other, especially since classical liberalism is fairly close to what we now call libertarianism, so it has another name.
Fascists ditched all the remotely progressive, leftist, revolutionary or socially-conscious components of their ideology pretty much as soon as they seized power anywhere. They always ended up siding with monarchists, big business, the army, etc. I don't think this was random coincidence.
The novel modernist leftist window-dressing was always weaker than the core traditional/reactionary values they were trying to rescue and enhance through untrammelled state power.