Is it me or are people who constantly brag about being "mature" and "intelligent" usually the least of these two?

I've been finding a lot of opinionated posts by people who claim to be "mature" and "intelligent" -- usually lamenting a world that is not up to par with their so-called intellectual capacity and eloquence. Yet, I've noticed that a lot of these posters tend to be insolent and rude whenever someone posts a comment they do not like. Do you think being intolerant of people's differing opinions make you mature and intelligent? How can we work on accepting each other's opinions while still maintaining firm belief in our own? Is learning to live with people of differing opinions and values a sign of maturity?
Is it me or are people who constantly brag about being "mature" and "intelligent" usually the least of these two?
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