People who feel like outsiders often notice what insiders walk right past.

Standing slightly outside a group sharpens your vision. You have to work out the unspoken rules rather than absorbing them, so you see the hierarchy, the double standards and the things everybody has agreed not to mention, none of which are visible to people who have been comfortable there from the start. That is a real skill, even when it arrived by a lonely route.

Write down one thing you can see that the insiders cannot. Then use it: say the obvious thing nobody says, or make the new person’s first day easier than yours was.