Today’s second glitch:
This one is grammatically correct, but it still has a big problem.
It’s another of those “all are not” statements that don’t mean what the writer (or speaker) thinks they mean, because the placement of the adverb (yes, an adverb — deal with it) not affects the meaning of the words around it. As written, what this example means is that nothing needs to be talked about. (Everything doesn’t = nothing does.) What the writer means is that not everything needs to be talked about (allowing the possibility that some things do need to be talked about)… so rewrite the sentence to make it say that.
Not everything needs to be talked about.