i don't follow etiquettes just because some one made it ,
it depens on if i/we like to open a special bottle especialy if it is a sweet wine and vintage port.
our thougt is "why dink it at last only because it's a roule or because it's the most massive wine from the evening, we rather open and at lesat enjoy half of it wile the sences and brain are fully intact!
so sometimes we start with the port, than a riesling than a bubbly (rarely we drink bubbly's) than reds than sweet than maybe the rest of the port.
the most important thing is to make shure to clean up youre tong, by drinking whater or eat somthing or just let pass a litle time.