Telling people not to use a word, whatever might be said about it being a good idea or not, is not fascism. "Fascism" is a specific social phenomenon that has emerged from the decay of capitalism as reactionary popular movements that seek to offload their poverty onto social minorities. "Taboo words" have existed for about as long as language has existed for an endless variety of reasons. Whether having some words be taboo is good or bad, calling it fascism is completely ridiculous.