I think a big part of the problem is that the last couple generations, in general, just don't know how to behave (or dress) for formal and semi formal occasions. I know I have some minor issues with it, just because I don't have much practice or the clothing budget.
Graduations, weddings, funerals, even going to court, a lot of younger people havn't been exposed to MANNERS, and i'm not talking please and thank you. Most of our cultures more solem customs have been turned casual.
I would say this is the one real benifit of going to a more formal christian church (well, other then the spiritual stuff) as those who do have to dress "up" every week and behave in a more subdued manner.
Think about it, when was the last time you went to a really formal wedding? Even funerals can get a little wonky. During both my Grandfathers and Grandmothers funerals, a few people my age showed up wearing black clothing that was more appropriate for a night on the town then a funeral, and got confused by the receaving line at the veiwing. Conversly, at my Great Uncles funeral, I was the only one there under the age of 30, and it was exactly what one expects (well, as much as it can be in my family
we all dressed and behavied with manners though)
We, as a culture, are losing our capibility for traditional ceremony.