What kills me is... 

a) An incredible number of self-assured posters here don't read the other posts before commenting so authoritatively on things that have either already been said or disproven. 

b) An even greater majority of posters here and users in general, who vociferously defend or attack an operating system, do so with no or little experience of the "other" operating system in the discussion.

c) And to cap it off, so many of the posters here throw "facts" out there that they've never bothered to confirm, as though stating were all the proof required.

No operating system is immune to viruses, just as there's never been a human that's cheated the common cold. But fact of the matter is that some are designed to resist attacks better than others. Those with a technical background (hackers included) can tell you which systems those are.