I wonder how many people who throw accusations of "closet X" and "stealth Y" so easily are, in fact, themselves closet X and stealth Y and generalize about other people based on their own carefully hidden prejudices.
Shifting the argument to "bad faith", "closet X", "stealth Y" is exactly that: It says nothing about whether something true, only that "it helps the bad guys."
This is frowned upon, because there is no bottom to this race downwards. Anyone can accuse anyone else of being a horrible, rotten human being who just puts up a tolerable facade.
You say this as if human beings are entirely unfamiliar with the use of facades in everyday life (need I mention most women's familarity with "the nice guy"), more so in those domains where power and position are at stake.