According to the census, in 2019, 92% of Americans had health insurance. According to polling, the majority of Americans give a good rating of the insurance they have:
Even with the highest deductible, 46% of those folks gave their insurance an A or a B.
We should absolutely expand our healthcare options in a way that doesn't tie your coverage to your employment status. But advocates are essentially stepping on rakes whenever they message this as "people don't have coverage" or "people hate their private insurance." Most people do have coverage and they rate it favorably. It's about helping people who don't and the messaging has to acknowledge that this group is smaller than a majority for sure. A voter who is in the majority (has coverage, rates it excellent or good) isn't going to agree with the statement that "private insurance sucks and needs to be torn down."