That’s some nonsense from Bernie. Unions have fared better under Biden than any President for decades, and Bernie knows it. This is posturing image-burnishing for the naive; you think Bernie doesn’t market himself to all the young progressives? Then, when the cameras are off, he turns into a garden-variety Democrat, voting solidly with this elitist-run party every time, without pouting and making protest votes or anything like that.
Oh, my sweet summer child.
Read a book.