NPDs can taker mood stabilizers, anti psychotics & anti depressants, if you notice negative side effects, stop taking & try new ones after a months break.
Your wasting your time watching another human being all the time, you should spend your time on self improvement - mentally, emotionally, spiritually & physically like I do.
Following rules from long ago, not changing them so they are more advanced & changing to fit the times can leave the group stunted mentally, intellectually, emotionally & spiritually. Make the rules contain no abuse, prejudice, bullying, all to have human rights.
Make a conscious effort to change your abusive ways, make the latter part of your life all good with as few flaws as possible so when you pass people have lots of great things to say about you, you can be remembered as someone who changed for the better.
I often behave like those around me, if you don't like my recent behavior, you don't like your own behavior so try & change it so you can be more proud to tell people how you are as a person. Say out loud the things you say & do, if it sounds terrible, you need to make changes.
Making fun of others, mocking, etc is very immature, especially if your an adult. Try & grow up & be an example to the children of how to be a good, kind, respectful person or they might have many problems in life if you don't.