This is a good example actually.
An airline does things like loses your bags, gets delayed repeatedly or says you can only travel with a teeny tiny bag before you have to pay extra. These things amount to a ruined vacation or you have to pony up an extra $50 because your suitcase doesn't fit? This frustrations might ruin a trip, and you swear off flying United or whatever, but interacting w/ airlines are not mandatory to live and so while airlines are often hated, no one is merking airline CEOs.
Airlines are not comparable to healthcare that might affect the ability for you and yours to live. Housing is a bit better, but only if we are talking +20 year mortgages or situations that are extremely exploitative such as no heating in the winter, lead poisoning, asbestos, etc.
Again, I ask the question... have you had any meaningful interactions w/ the healthcare system? IIRC, the stats show that the ppl in the US typically have a positive outlook provided they don't have to use it. As soon as Americans use the system, their ratings drop.