I think what people mean is that it's not necessarily good to boast about being intelligent, as it can make other people feel worse in comparison.
When I was tested in grade 6, I was qualified as having "average" intelligence, but I'm not sure I believe that as I always tend to score in the top 2-3% of the state for pretty much everything (unless I try really hard or something?).
But at any rate, welcome to WP! The conversation here is quite intellectual (compared to other forums at least) I've found, and thus more enjoyable.
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Into the dark...