There are people who are smart, and primarily belittle other people with it. There's a lot of these in the computer security industry, for reasons that should be clear.

There are people who are smart, who do not.

There are people who are smart, give you ideas, and let you take all the credit.

And there are people who are smart, and subtly guide you until you discover "your" idea on your own.

I suspect that there's some positive feedback in this; if you are successful, you tend towards the latter, more cooperative end of the spectrum, and then people, seeing that you're kind, think more highly of you, and give you more respect and on balance you end up more successful. The converse is also true (I'm battling a little envy and frustration myself).

There's a saying in politics that "nobody cares how much you know until they know how much you care", and it's both corny and tainted by association with politics, but there's some truth in it; high intelligence is value-neutral - it can make you a more effective dick just as easily as it can make you a constructive force.