Insecure And With Self Esteem Issues

Why is it... Those insecure and with self esteem issues, Are apparently also the ones most boisterous? Rowdy, loud and lack social etiquette. And always opinionated of those self assured. Especially those who have defined their identities. Only to say they are not being who they should be. While those insecure with self esteem issues, Always seem to be seeking attention... As if to prove that being obnoxious, Is their interpretation of being down to Earth. And always at someone else's expense to demean.