Why should you stay away from your classmate circle after graduation?

People who’ve been through it say: After graduation, try your best to cut off contact with classmates.
Any contact is a burden—people will resent that you have and laugh at you that you don’t.
Once it involves asking someone to do something for you, you have to talk about money; as soon as money gets brought up, the relationship instantly falls apart, and a good classmate turns into an enemy in seconds.
These lessons are only something people in their forties or fifties naturally understand.