I think you bring up great points but I feel the categories are broad enough to be unhelpful, even if there are statistical trends that bind their members toget

I think you bring up great points but I feel the categories are broad enough to be unhelpful, even if there are statistical trends that bind their members together. I think class lines are more relevant than simply "white males" or "women" or "people of color" since people within those categories often have lives so different from one another as to be unrecognizable (think Malala vs. Emma Watson for instance). Ultimately they are also poor strategic choice because they needlessly alienate people that could be supportive of your political goals, and also give detractors additional ammo (for instance the "white worker with black lung" mentioned below) which leads the debate to be derailed for the most part.