A key reason why so many individuals are toxic is because, put simply, they have no boundaries.  They feel they have nothing to lose by making your life as miserable as they possibly can -- often because their lives are that way. They have little regard for your feelings, perspectives, and opinions, as they deem theirs far superior. If you object to their assertions, prepare to be scorned. Toxic people loathe dissent.  They are often narcissists masquerading as good, humble folks -- that is, until their chameleon tendencies come to light and you realize they have no one's best interests at heart but their own. It's no wonder so many of these mercurial individuals find themselves in top positions in the corporate world. They schmooze their way to the top, and once there, dispense misery upon unsuspecting worker bees, hastening those employees' eventual resignations. Their toxic tendencies extend to their personal relationships as well. Three or more marriages are typical. Th...