Well, this explains Hawkeye fans.

And Kos Kidz, gangsta rappers, NOW, etc:

From screaming baseball fans to political rally-goers, groups that engage in boastful self-aggrandizing may be trying to mask insecurity and low social status.

I fully expect someone to denounce the study as racist.

(They don't say what it means when you cry yourself to sleep wearing your Brewers pyjamas.)