Linguistic query: "Twisty twisty, icky icky"? Never come across that one before.
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It's true enough that the Nazis didn't invent ideas like mass sterilisation of "the unfit", which had already been put into practice most especially in some American states. It's estimated that about 60,000 American were sterilised over the years, until in the wake of Nazism this kind of "Social Darwinism" ceased to be seen by some people as "progressive" or "enlightened. Here's a thought provoking extract from a book about all that.

It's as well to guard against those kind of ideas sneaking back into fashion.