I agree Bernie's was running on a social democratic platform—political terminology in the US is very confused, and I often suspect that's deliberately done by the media.

The bottom line is Bernie's policies would've disproportionately helped people of color. Privileged people don't give a damn about that.

Have a couple of quotes from black folks who care about working-class black folks:

“If any class-reductionist leftists actually exist they would still be 100 times more helpful to black people than neoliberals.” — Leslie Lee III

“Nothing declares one’s own class allegiances more eloquently, after all, than the accusation that one’s opponents care only about class.” — Adolph Reed

See also: https://medium.com/a-universalist-in-an-identitarian-age/mythical-class-reductionists-vs-actual-race-reductionists-187cd8d767b3