Every standard is relative in politics. As I said, for his time Lincoln was fairly progressive, now he'd be far-right on issues of race, and the radical Republicans of the time were the people who (gasp!) thought blacks and whites were equal, which a vast majority takes as a matter of course now. Within America there are a variety of positions in regards to, say, women's rights, but damn near everyone there agrees that the situation of said rights in Saudi Arabia or some African countries is appalling. I'm sure anyone can think of countless other examples in the US alone, divided as it is among social, cultural and most of all economic lines. Even your Supreme Court is politicized as fuck, where in most Western democracies it is far less.
You're trying to claim there's some set-in-stone objective standard that cannot really exist and you yourself even admit cannot be measured, then do your damnest to hold the Democrats and only them to it. That's why people are calling bullshit, it's an untenable position that falls apart the moment there's a hint of scrutiny thrown its way. You just want to shit on the Democrats and people who might support the party. Fine, have it your way, you have a right not to like them for whatever reason. Just don't sugarcoat it with fake-ass concerns and standards that don't fool anybody.