My friend explained (over many arguments over many months) he simply does not want to pay for anyone's healthcare. He goes to work, and pays his own. He expects others will go to work, and pay their own. End of story. It's that simple for him.
He doesn't even care if paying a little more tax would result in better healthcare for him. He'd rather have shittier healthcare himself than accept paying even a tiny bit for another persons healthcare.
It's completely unacceptable to him that he should have to go to work more (i.e. pay more taxes) to fund someone's healthcare.
I get it. He doesn't care about a "we" society where we all look out for each other and share the wealth and do well, he wants a "me" society, where me does well.
NOTE: Not my views, don't shoot the messenger.