I'm responding specifically to the claim that Sanders didn't do enough for the south over the past 50 years.

The commenter was asking what Bernie has done for civil rights for the past 50 years, not "the south". Exact quote:

his supporters were) were like Sanders is great he was in the Civil Rights Movement! And folks were like OK. You mean he got arrested one summer in college. That is great and we appreciate that, but what has he done in last fifty years?

Vermont is extraordinarily white: why did Bernie not choose to run for mayor in a less white area, if he really was interested in advancing civil rights and helping people of color?

There are still some nonwhite people in Vermont: why did Bernie spend all his time thoroughly ignoring their attempts to work with him?

Bernie has been in the House of Representatives for 25 years: why has he ignored all nonwhite people's issues, groups, causes, etc.?

Why did he spend his whole campaign saying racism is just a class issue?

Hillary never let anything stop her working for nonwhite people's rights all her life. No matter if she was in politics or out of it, no matter at what capacity she was involved in politics (as first lady, ffs, she was not tasked with ANYTHING but throwing parties and putting out cookie recipes) - she found ways to work for the causes she believed in.

And here we have Bernie wringing his hands and saying "but I can't do anything for people of color all the way up here from Vermont! It's so unfair that you expect me to!"

Man, at some point you gotta face it. Bernie didn't give a shit about nonwhite people.