True insiders: can you do bad things together?
If you won't even drink at the boss's insistence, how can they expect you to work overtime or go on business trips—and even worse, be convinced to break the rules alongside them? In other words, it's a test of each other's limits: both sides are figuring out the other's attitude, boundaries, and whether they can trust you as one of their own. That's what "one of us" really means.