Marginalized identity is directly related to the kinds of hardships that parent claimed were not directly associated with marginalized identity (see the first sentence). You generally have to go pretty far up the income/class scale to find black lesbian who's better off than a given poor white man.
To put it a way most guys here will understand: how much more money does a 5'4" man have to make to get the same social and professional consideration as a 6'2" man? Identity is not destiny, but at the same time, you'd be forgiven for getting that impression from a glance at American society.
It is very much so, especially in Western countries, where members of the black diaspora tend to be found and are able to express LGBT identity without fear of facing full and immediate ostracization (though violence is still a risk). If you consider, for example, suicide risk a crude measure for (lack of) life satisfaction, being LGBT reverses the black-white disparity (wherein white people are more likely to commit suicide, considering the general population).
To put it a way most guys here will understand: how much more money does a 5'4" man have to make to get the same social and professional consideration as a 6'2" man? Identity is not destiny, but at the same time, you'd be forgiven for getting that impression from a glance at American society.