Apple does not say that Mac's don't crash..... I worked Apple Tech support about 5 years ago.
People say Mac's don't crash.... People also say Mac's don't get viruses. (People are idiots though). I have news for you. They do crash.
I think that because (and I don't have exact stats) if 90% of the Computers out there are PC's and 10% are Mac's.... then for some people it stood to reason that 90% of the viruses were made on PC's, for PC's. You had a much better chance on a Mac to potentially come across something malicious, and it wouldn't affect you. But, people can still create viruses for the Mac operating system, and they will crash.
The guy making this video heard on the street that Mac's don't crash.... and he can't figure our what's going on? He's an idiot.
Cheers!