As your post suggests, anyone claiming to live in accordance with the Bible or some rules therein, is actually living in accordance with their personal, subjective interpretation, which exists within one of countless possible hermeneutics (interpretational systems), or possibly two or more superimposed ones. For example when I was an evangelical I used four of the five points of Calvinism, combined with Dispensationalism, Literalism, and a few other dogmas and I resolved the inevitable resulting inconsistencies as I was taught to rather than critically.

I guarantee you that in doing the above they are also ignoring many parts of scripture that don't appeal to them. I used to say "miracles are not for today" to Charismatics, "grace fulfills the law" to strict legalists, and "once saved always saved" to those from the Holiness tradition. And like most Christians, "the New Testament overrides the Old (except when the Old is convenient for my purposes)". Well I left that parenthesized part unsaid, even to myself -- but you get the general idea.

So mostly if someone were chest-thumping about their adherence to scripture I'd ask them exactly what the main teachings they hold to, then I would point out that people of good conscience disagree with them, and then invite them to explain how they can differentiate their particular dogma from personal preferences or their imagination. They won't be able to do it. They'll just sputter and get indignant.

Sarah Palin once said that this is what she believes...not recognizing that this would put her in immediate danger of being stoned to death for wanting to be in a position of power over men.
And I hope she was a virgin on her wedding night. If not, then more stoning would be in order.
Adulterer...stoning...etc

There's a new TV show about a guy doing this, can't recall details but I agree that its impossible without going to jail, and maybe the electric chair. People can be so stupid.