I haven't read all 7 pages of this thread.
But I do know this is one of the most talked about topics. The original poster and I are in the minority, but I generally agree.
Seeing someone not all that dressed up does not ruin my experience or make me angry. But I do not think it is too much to ask for people to dress "nice" in a "nice" restaurant.
The large majority of posters here (who I am sure are all nice people) feel it's okay to dress like a bunch of bums and slobs anywhere in Disney because it's Disney.
I do not agree.
The Magic Kingdom may be a theme park, but Citrico's, the California Grill, Yachtsman's Steakhouse, Jiko, etc., etc, are not.
I'm not saying you need to be in a tuxedo, or shirt and tie. Packing a nice shirt and slacks, going back to the room, and freshening up is NOT all that difficult.
I do not blame WDW at all for having dress codes and enforcing them. It's their business, after all.
I know I'm in the minority, but I give the OP credit for saying something that needed to be said.