Try telling a self-evident truth, or a truth for which you have rock solid evidence to support, or a truth that you have absolute proof of to a person who believes otherwise. See what happens. You will be ridiculed, called ‘names,’ and shunned. The open-minded and critical thinker will consider, accept, and thank you for the correction. The weak minded, the one who is frightened of change, the one who’s pride will not allow admitting error, that one is weak. For them, their opinion is their truth and nothing will change it. But the truth remains the truth. For these, the only answer is to walk away. Expenditure of time and energy with them is a waste.