Do we lie to ourselves because we know no better, which means we are ever so comfortable with lying leaders?

Is it okay to leave a dinner party if you notice the host has poor hygiene habits, even if it causes tension?
How can I stop talking about problems? When going through a depressive episode I feel this urge to rant about my problems/feelings even though it's ultimately pointless and I eventually regret bringing it up. How do I control this urge?