Fascists in mainstream politics: mock a leftist concern exactly until it looks like they might start winning elections with it, then adopt that exact concern but blame immigrants for it (ongoing example: eco-fascism)
Fascists in tech: mock a technology created by trans people, women, academics working in unfashionable and underfunded subdisciplines of CS etc. until you notice it actually works for building working software, then use it to build software that kills immigrants