On one occasion a caste-ridden brahmin insulted the Buddha saying. “Stop, thou shaveling! Stop, thou outcast!”
The Master, without any feeling of indignation, gently replied:
"Birth makes not a man an outcast,
Birth makes not a man a brahmin;
Action makes a man an outcast,
Action makes a man a brahmin.”
Here in America, we regretably have a caste system that punishes and ostracizes the chronically impoverished, people of color, those who are seen as less than physically, mentally, or emotionally capable, people of size on both ends of the spectrum, etcetera. It punishes women of all ages, colors, creeds, and more. It punishes children who are born under these inauspicious circumstances.
One of the aspects that I can appreciate about Buddhism, particularly modern teachings, is the push towards advocacy. That it is our moral and ethical duty to be a champion for others.