So did Atheism + bite the dust?

[Pyrrho]

The first problem with that idea is that the term itself associates feminism with nazis. I could just stop there

Again, the term is not literal. There is also a term called the PC thought-police; a reference to politically correct loonies who seek to censor free speech and anything they dislike, they are not literally the police but it is clearly figuratively speaking.

as that is enough reason to avoid the term.

If it is used in figurative terms, which was the intent when created, then I disagree.

The second problem is that people who use that term commonly use it for all feminists. (E.g., Rush Limbaugh, etc.)

I did actually agree that it can be be used to conflate all of Feminism, but it can also be used to separate and disassociate the bigoted radicals from the reformers. In that regard, it is a beneficial tool so I am afraid it works both ways.
...

Do you regard all words in like manner? For example, do you call bad black people "niggers" and distinguish them thusly from good black people? Is that, too, a useful tool? Or do you think some words are problematic and should generally be avoided?