If you consider the 'cultural ethos' that gave rise to disc golf and compare it with that of ball golf, it's a small wonder that disc golf isn't more 'rowdy' than it is, etiquette-wise.
Etiquette is predicated on consideration for the other person (we understand what 'hurts' us, so we choose not to engage in doing that to others), and in the case of 'honor', one would be willing to 'bet' his entire land and holdings upon faithfully upholding said honor.
We are obviously not an honor based culture anymore - even in the abstract, 'character-based' sort of way. Many people just don't care or seem to understand that the discipline required to play by the rules and be a 'good sport' are what make the experience valuable - as corny as that sounds...