When aunt alexandra speaks of people being "trash," she's referring to their appearance the quality of their character their lineage their manners

She is referring to the quality of their character. I hope this helps :)

Ifound this on google “preview — long walk to freedom by nelson mandela. “i am fundamentally an optimist. whether that comes from nature or nurture, i cannot say. part of being optimistic is keeping one's head pointed toward the sun, one's feet moving forward.” i hope this you for what your looking for.