I learned when I was a child it was dangerous to be the smartest person in the room. It's much safer to appear to be the village idiot, or at least less bright that the brightest. I do disagree fundamentally with the concept of the evils of merit - merit is so much more than smarts and formal education, its a mix of capacity for the role, agreeability and eagerness, productivity, effort expended, grooming and appeara…
And it carries over into adulthood. One of the unfortunate things to learn is that sometimes, one just has to not say anything. Don't be smarter than the boss, nor too independent (yet not too clingy or stupid). Always a balance. Fitting into the mold actually goes further than actual intelligence.