Considering nothing happened, there is no victim not being believed.

Meanwhile, no one just blanket says "believe victims" with no context related to what they were supposedly victimized by. "Believe victims" is in the context of sexual assault; is the claim that the person was sexually assaulted?

I'm also not a person that has ever claimed that anyone claiming to be a victim should be automatically believed, especially if that person has a compelling reason to lie. In this case, the person has a reason to back their brain-dead degenerate parents' play.

The sensible middle-ground to your construct is "Seriously investigate claims, but in the absence of evidence, consider the source". I'm not going to abandon all reason because of some weird set of rules invented on Twitter.