I think you misunderstand your parent. Here is the full quote:
there is no symmetry in these biases (e.g. the false equivalence of misogyny and misandry)
It does not mean that there is never a case of sexism against men or racism against whites. What it means is that you cannot simply flip mysogyny and misandry, or racism against minorities and racism against majority. One major reason is the power imbalance - you can read more about it online but the simplest example I can offer is that of sexual harassment where the power imbalance is essential to the problem, i.e. a lowly employee asking for a date with their boss is a fundamentally different problem than a powerful boss asking for a date with their employee. Another reason is systemic vs. individual discrimination - again, other people explain it better than I ever could but a very simple example would be that everyone across the board, meaning men and women both, discriminate against equally-qualified resumes with female names on them, evidencing that our whole culture is systemically sexist in one direction.
And if you read carefully what that parent was responding to, it will make even more sense.
there is no symmetry in these biases (e.g. the false equivalence of misogyny and misandry)
It does not mean that there is never a case of sexism against men or racism against whites. What it means is that you cannot simply flip mysogyny and misandry, or racism against minorities and racism against majority. One major reason is the power imbalance - you can read more about it online but the simplest example I can offer is that of sexual harassment where the power imbalance is essential to the problem, i.e. a lowly employee asking for a date with their boss is a fundamentally different problem than a powerful boss asking for a date with their employee. Another reason is systemic vs. individual discrimination - again, other people explain it better than I ever could but a very simple example would be that everyone across the board, meaning men and women both, discriminate against equally-qualified resumes with female names on them, evidencing that our whole culture is systemically sexist in one direction.
And if you read carefully what that parent was responding to, it will make even more sense.