Liberal animus towards the left is a relic of the cold war. The left had to draw a bright line between its policies and those that could be painted in any way as "communist". This is why Sanders is so appealing to the younger generations. Capitalism in its neoliberal suits since 80s Reaganomics, Thatcherism and TINA, and the IMF / World Bank "Washington Consensus" has failed so many people several times the youth are looking for answers that are not available to Boomers still snake bitten by reflexive anti-communism.
But the cold war's over. We won.
We can stop with the rhetoric and instead look for answers that solve
the problems for everyone. Sanders may have lost (or is still walking
the precipice) but hopefully this is not a flash in the pan, but a
coming to consciousness for many.