Malicious people will call one a liar for speaking the truth.
For speaking a lie when they get caught malicious people will falsely state the truth, even sometimes expressing a tone of disdain, to cause intimidation and to deliberately give off a misleading impression with the intent to deceive.
Ill-natured people will often lie while aiming to tell what is perceived to them as truth and intentionally adapt themselves into believing their own self fulfilling lies.