Say what you mean and mean what you say

I don't get neurotypical extroverts. I have no ability to figure whether people are saying what they're saying because it's true, or because of the effect they think it will have on the people they're saying it to. I can't weigh their sincerity. A statement that the speaker believes, a statement that was what they thought I wanted to hear, and a statement calculated to evoke anger or sorrow or guilt or fear or surprise or delight or agreement in me--they all sound the same to me. I weigh the words. Which means that people who don't say what they mean and mean what they say find me an extremely easy target for manipulation.