Food for thought.
On a side-note, if you can observe and discern another person's parameters - their motivations and principles, their character and so-forth - you can learn to anticipate the reactions and behaviors of those around you. This takes attention/observation and a certain level of active awareness. It also takes time, which may vary from person to person, influenced by many factors such as openness, self-awareness, how talkative they are, etc.
For example, one man I knew suggested at my speaking a need for help due to my illness that I should go back to the one he knew was my abuser rather than bothering people like him. Clearly troubling and upsetting. Months later, I heard him state his deep belief that under all the 'problems' a family might have, they are all actually good in the end. Suddenly, his dismissal (though still inappropriate) made much more sense.
I call it 'tipping the hand'. We all do it eventually. Some might feel threatened by that idea, but if you are introspective enough to be self-aware and honest about it, I think it would only feel threatening if you don't like what you find. If you know yourself, you might find that it makes things easier to simply be up front about things to begin with. Many don't understand why I am open and immediately so, but these very concepts are what help build my parameters.