Morality and law both work like mathematics. This means that my beliefs are constructed, and once I have a construction, the only in bounds way to convince me to change my mind about them is to show me that my beliefs are inconsistent. Moreover, understanding someone who has already demonstrated an inconsistent belief system is easy. They believe X because they believe something and its negation, and at least one of…
To add to this, _everyone_ has some kind of inconsistent belief system. It's fairly simple to determine this, when people get defensive it's almost certainly based on something incongruous between their beliefs and actions, or possibly broaches a belief they hold to be true, but are unable to demonstrate why it's true. Therefore causing defensive behavior when challenged. I.E., very few people get upset if you say "t…
This is silly folk psychology. There are many reasons people get upset when people contradict them, raging from respect issues to believing that such contradictions are actual mortal dangers. People get quite upset when you disagree with their belief that all people have a right to life and counter with the proposition that the group they belong to should be exterminated, for example. It has nothing to do with their alleged inability to debate you. It's that you've indicate you're a threat to their life. People get quite upset when you strawman them or condescend or patronize in your response. There's a whole rainbow of reasons to get upset and very few of them are about some inability to debate you.