Xbox is down for all.

yes the entire internet was down.

no it's just you! It's very unlikely that the internet could be down as the underlying technology was developed years ago to route communications around points of failures, specifically in the event of nuclear war. The only way to take out the net that i know is to send down the top-level domain name servers. That would be the equivalent of throwing the phone book away.

I consider myself to be a professional in our industry and sarcasm / deriding people who have less technical knowledge than ourselves is quite frankly pathetic.

I'm sure the OP has knowledge of subjects that he could equally beat you into submission with. Remember if everyone knew as much as you did about computers then you probably wouldn't able to get a job with that nice Jaguar XF company car.

underlying technology was developed years ago to route communications around points of failures, specifically in the event of nuclear war.

listen it's pretty safe to say that even without technical knowledge that if the internet was down it would be the top story on the news. It is obviously such a part of so many peoples' lives that the modern person under 30 would struggle to function. There would be people crying in the streets. You don't need a vast amount of technical knowledge to guess that it probably isn't the world, it's probably you. That said, I wasn't deriding, the initial comment was a jokey one, and prob should have put a smiley. The rest (which may not be 100% accurate) was intended to be informative. I find people that go hunting around in people's profiles for info to dig up on them a bit weird. What does my car have to do with it? By the way I own it, not that it matters!

ok why was it developed by defence research?

Common ARPANET lore posits that the computer network was designed to survive a nuclear attack. In A Brief History of the Internet, the Internet Society describes the coalescing of the technical ideas that produced the ARPANET:
It was from the RAND study that the false rumor started, claiming that the ARPANET was somehow related to building a network resistant to nuclear war. This was never true of the ARPANET, only the unrelated RAND study on secure voice considered nuclear war. However, the later work on Internetting did emphasize robustness and survivability, including the capability to withstand losses of large portions of the underlying networks.

Although the ARPANET was designed to survive subordinate-network losses, the principal reason was that the switching nodes and network links were unreliable, even without any nuclear attacks. About the resource scarcity that spurred the creation of the ARPANET, Charles Herzfeld, ARPA Director (1965–1967), said:
The ARPANET was not started to create a Command and Control System that would survive a nuclear attack, as many now claim. To build such a system was, clearly, a major military need, but it was not ARPA’s mission to do this; in fact, we would have been severely criticized had we tried. Rather, the ARPANET came out of our frustration that there were only a limited number of large, powerful research computers in the country, and that many research investigators, who should have access to them, were geographically separated from them.