This is incorrect. There is not enough space to write why but in a short and sweet version of why:
Mac does not have the folders the virus will be searching out, macs do not have a registry like windows.
There is MUCH more to it but thats the short version. A virus is not going to affect your hardware either.
I believe the poster meant that a virus on the bootcamp partition would affect his Mac partition about as much as a virus on a completely different machine would (that is, not at all).
I'm with everyone here - your mac is a far, far more capable windows machine than a netbook is. I had a netbook for a while as my secondary machine to travel to/from school with, and I recently sold it and have picked up an Aluminum MacBook, which I have running OS X and windows.