A phrase used specifically to indicate your dismissal of a particular statement, event, or viewpoint.
It is used to categorize something as noise, primarily. As if something is not even valid enough to be considered having a form. In reference to a viewpoint, it would indicate it's validity being on par with random noise.
As anyone would, with some random noise blaring out of a speaker, "fuck that", is expressive of a desire to mute it.
Bob is really heated about _______ and _______ at a party. He begins to express his concerns, until someone proclaims "Fuck that noise you are blabbering about" . Laughter follows.
:"Fuck that nigger shit!" is a term used mostly by white males to express their interest in a set topic or action. Also, the term does always show direct racism toward blackhumans. This is found most commonly in the term "Nigger" and it's plurals. See example part (B).
(A)John: Hey, bro, let's go bowling!
Thomas: Fuck that nigger shit! I'd rather go to the movies.
(B) When using the term "Nigger", one does not always use them word in reference toward black males and/or females. See example (1)
In this instance, Josh is not trying to say that his friends are black males and/or females. He is trying to reference them to stupid, ugly, ignorant, or bad people.