I think being asked to bring a plate is rude. Every shower for anyone I've ever thrown I've made all the food. It's like saying buy me stuff, cook for me coz I'm having a baby. Baby showers aren't just about presents. But if you EXPECT them then I am sure as hell not going to bake you food as well.

The irony is I always offer, but when asked or its assumed I find that rude. And generally it's no.