It's just so obvious to anyone paying any attention, and probably also to those who don't pay a whole lot of attention, that the Democrats are liars. When they refuse to do something good (taxing the rich, medicare for all, making immigration easier and less barbaric), they tell everyone that they are following the wishes of their constituents and need to preserve their political capital for more important things. Which is an obvious lie because these things consistently poll incredibly well, and we already know that these "moderates" don't exist would never reward a Democrat for behaving like Manchin or Sinema.
But at the same time, they are clearly willing to do unpopular things so long as those unpopular things align with the priorities of wealthy donors and lobbyists. And when they're criticized for these unpopular things, they tell everyone that they are "standing up for" what they (claim to) believe. So, they are willing to exhaust their political capital, but only when it serves special interests. Never when it serves ordinary people. Which is why the Democrats are hated even more than a pedophile who's trying to reenact the Holocaust.