There is a vulnerability (yet another one anyway) in the wokeosphere open for a troll to exploit: simply running around claiming people are white.
Because in practical terms standpoint theory means your race determines your speaking value in the progressive stack, and because bad SJ types will be more likely to believe this kind of accusation, it would be quite dangerous to one’s social standing. I won’t go into further details because I don’t want to encourage it, but defense on this would not be easy.
For my part I see this kind of vulnerability as an indictment of the system itself. Its axioms and patterns make it essentially unsolveable without either tight restriction of access or changing to something else.
The irony that the opposite probably wouldn’t work on White Nationalists isn’t lost on me.