The burden of proof has been made irrelevant, because they rely more on subjective “experiences” rather than refutable claims. They cite some experience of theirs, and then extrapolate that out to build some overarching framework of societal behavior. If you disagree with the proposed framework, they hit back with “who are you to deny my lived experience?”
People can report individual experiences all they want, without an outsider having sufficient grounds (usually) to refute it, because experience is internal. The problem is that second step they take. When they begin making actual claims, that’s when their stories are fair game for rebuttal.