The bias the press has is a bias to the facts. That's the problem for Trump, because his statements are typically and widely at odds with the facts. So, reporting the facts is his enemy.
Regarding the differences between liberals and conservatives, as I've written here before, liberals believe in a free market economy in which society’s winners are taxed to pay for a social safety net. This is morally superior to the capitalism red in tooth and claw we had before the New Deal. The other side believes that people have a right to keep what they earn, and that taxing them to support others, no matter how needy, amounts to theft.
How has this panned out over time? During the Gilded Age, income remained about as unequally distributed as it had been the late 19th century – or as it is today. Public policy did little to limit extremes of wealth and poverty, mainly because the political dominance of the elite remained intact; the politics of the era, in which working Americans were divided by racial, religious, and cultural issues, have recognizable parallels with modern politics.
FDR and the New Deal brought a new page. Income inequality declined drastically from the late 1930s to the mid 1940s, with working Americans saw unprecedented gains. Strong unions, a high minimum wage, and a progressive tax system limited inequality.
Then, at around 1980, movement conservative got a foothold in political dominance. As a result, taxes on the rich have fallen, and the holes in the safety net have gotten bigger, and inequality has soared. And the rise of movement conservatism is also at the heart of the bitter partisanship that characterizes politics today.
The Congresswomen in question merely want to defend the social safety net -- that existed for much of the last century and they want higher taxes on wealth, which also existed for much of the last century. The top 70% tax-rate that AOC took criticism for existed for most of the last century. It's not a radical idea at all. The radicals are those, like Trump, who want to eliminate social programs so taxes on the rich can decline.