In fairness, I'm not sure if this is always true, but it seems to model well onto my own experiences.
Dishonesty is foolish & self-destructive.
Conversation
People get confused - partly because of cultural pathology & con techniques preying on social obligation, coercing you to overshare - hence, "honesty" can seem stupid.
But it's not very honest to share things you don't want to share. That is its own form of dishonesty.
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People are trained not to say "no" gracefully, so they think the only options are some variation on "fuck off!" or "ooook, I guess", which is simply untrue.
But it takes training to get this right, especially when people expect more of you than they have a right to. Difficult.