I think I made it pretty clear that I don't expect a white kid in Idaho that can't get enough money to leave the town, as long as he fights locally for more equality and goes online and works with national people of similar though on talking and so on, they're an ally.
Bernie had the funds, the mobility, and everything else to stay in Chicago, or move to the South, and be a Civil Rights 'general' in multiple ways. Instead, he (literally) said the rural life captivated him, and moved into one of the whitest states in the union.
Sharpton couldn't do that because no matter where he moved, he was still black. King couldn't march and then fly back to Montana the next day, because he'd still be black. Obama can't decide he's going to focus on his beet farm in Indiana, because he'll still be black. Us white folk don't get this bare simple fact that the reason the Civil Rights Leaders got shit done is because civil rights is their reality. It's not for us. With a change of a haircut and a suit, we can go from Hippy to Businessman in the white priviledged society. A black guy that gets his hair cut and in a suit is a Black Businessman. Bernie had the freedom to change his clothes and go elsewhere and did, black citizens encounter racism no matter if they are homeless or a millionaire. King paid for it with his life.
So this is why it's fairly damn easy to see why "but marched with King!" and "got arrested once!" don't hold much weight. He didn't have to live it, and chose not to live it when he could have.