Narcissists take things personally, so they are easily offended and upset by others. This can cause 'narcissistic injuries' and evoke feelings of insecurity, resentment, and shame.
Some common examples of vindictive behavior from narcissists can include being excessively critical of others or belittling others, keeping a list of people who they believe have wronged them, sabotaging someone because they feel wronged, intentionally making others feel jealous, giving backhanded compliments, etc.
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