ACA is horrible for the middle class. The only reason it retains any type of popularity is because the media refuses to associated ballooning cost to cost redistribution that it enables. Preexisting conditions? Middle class family picking that up. Subsidy? Middle class family picking that up.
In a wealthy and civilized society we have a moral obligation to care for all of our citizens. Some of them have pre-existing conditions and can't afford to pay market rates, so the middle class is going to have to subsidize them one way or another. Whether that subsidy comes in the form of higher insurance premiums or higher taxes hardly matters.
This is unfair to the ACA and factually incorrect. ACA subsidies (median household size) [1] are designed to start above the 50th percentile (income) [2].
The details matter. If you're a single person living alone at an income of $70,000.00, you're below the median household income and "picking up" other people's subsidies, but that's not indicative of the country.
[1] https://www.healthcare.gov/lower-costs/
[2] https://www2.census.gov/programs-surveys/demo/tables/p60/286...