If they weren’t dangerous, neo-Nazis would be ridiculous.
There are effective parodies. There is “Are we the baddies?” There are “National Feminist” marauders in The Star Fraction.
There is also the tendency for “ironic Nazis” to turn into actual Nazis, so it’s something to be careful about.
There is also the problem that parodying racism can give undo cover to actual racism, or reinforce Nazi fears of “white genocide,” or reinforce other racial prejudices. For example, Elizabeth Gould Davis’s comments about “Celtic feminism” and “Teutonic-Semitic patriarchy” are frakked up-- and not beyond any recognition.