That was word for word the logic that leads to nonsense like "all lives matter" as a reactionary response to "black lives matter".
"We should care about marginalized groups" does not mean "we shouldn't care about non-marginalized groups", it means "people are being marginalized so let's work to undo that marginalization".
"We should care about marginalized groups" does not mean "we shouldn't care about non-marginalized groups", it means "people are being marginalized so let's work to undo that marginalization".