manners? what happened to them?

Is there no etiquette anymore? Seriously, what happened to some of these kids?  They are great kids, really they are, but they have atrocious manners!  Since when is it appropriate to talk when someone else is talking?  Turn-taking? Yeah, right...me first, me first, me, first!  Snacking in art class went from munching on cheese-its to preparing peanut butter and jelly sandwiches while simultaneously crinkling paper bags as much and as loud as possible during lecture.  See the pattern?  I am eliminating this horrendous pattern once and for all.  Today my art students will be in charm school...