“One man means as much to me as a multitude, and a multitude only as much as one man.”
Letter 7 :On Crowds
To consort with the crowd is harmful; there is no person who does not make some vice attractive to us, or stamp it upon us, or taint us unconsciously therewith. Certainly, the greater the mob with which we mingle, the greater the danger. But nothing is so damaging to good character as the habit of lounging at the games; for then it is that vice steals subtly upon one through the avenue of pleasure.
The young character, which cannot hold fast to righteousness, must be rescued from the mob; it is too easy to side with the majority. Even Socrates & Cato, might have been shaken in their moral strength by a crowd that was unlike them; so true it is that none of us, no matter how much he cultivates his abilities, can withstand the shock of faults that approach, as it were, with so great a retinue.
You should not copy the bad simply because they are many, nor should you hate the many because they are unlike you. Withdraw into yourself, as far as you can. Associate with those who will make a better man of you. Welcome those whom you yourself can improve. The process is mutual; for men learn while they teach.