> Is this something that generally goes beyond school?

The things that make you vulnerable change depending on what year and situation you're in. I can very much get behind the idea that you should consider whether your legacy sense of what makes you vulnerable is relevant to your current circumstances. I'm not so much behind the "freely dispense the rope people will use to hang you" version.

> Is this about other people being immature or looking to abuse us? Is this something that generally goes beyond school?

Yes to both.

Psychopaths do to everyone what everyone does to out-groups, and we're all someone else's out-group.