The most important principle of social interaction is to stay away from people with bad character and foolish people.
Avoid working with, befriending, or marrying them.
Do not hold any illusions that they will change for the better.
Do not have a mindset of luck, thinking that dramatic things won't happen to you.
Do not attempt to change them; a person's essence is unchangeable.
When you encounter them, keep your distance respectfully.
By doing this, you can avoid many interpersonal relationship problems.
