A lot of oughties progressives fail to realize that they won the lions share of the first phase of the culture war going into the early teens. At that point, they stopped being progressive, and instead became the status quo (not necessarily conservative, but relativistically more adjacent to conservatism now).

Because they can't see this, they're loath to let go of the label in spite of the fact that they're now 'just' liberals.

Left-aligned culture warriors (sjws) are far more deserving of the label 'progressive', and generally the target of teeth gnashing about progressives. This is often taken as a personal, and non-sequiturial affront by those previous recipients of the label.