A nettop is a small form factor desktop PC (Dell Zino, e.g.). A netbook is a small notebook.

And, while they're often cheap, they're not all low quality. I bought a netbook instead of a Mac notebook, because it does everything I need it to, and it's cheaper, and the quality's good enough.

Some people choose not to buy Apple products. This doesn't mean that there's anything wrong with these people. Get over it.