Wow, there are so many good answers in here.

Thanks for being awesome.
I guess looking at it from a human standpoint, I can see how someone can
understand all social rituals and know about them, yet be awkward when they are put in them. I've seen it happen. I also like the theories that he is a bit whacky from the regeneration and that even though the Doctor should be able to see when people are hinting to that they want to be alone (A Christmas Carol) he would be a bit slow on the uptake (I appreciated that two seconds later the Doctor knew exactly what was going on and confirmed to Kazran that he was probably about to get kissed).
ravensheart18 said:
I think there are a few things at play here...
1) He's alien. They may not see relationships the same way.
2) He left home in a stolen spaceship at 200, what for his people would been a teenager when it game to maturity/age. A kid who ran away from home and started travelling the world in a stolen car might never quite fit in anywhere.
3) He's been through a lot of crap, especially the revival doctors. Each of them are clearly tramatized by the last Time War. He has wiped on entire civilizations - repeatedly. Everyone he has every cared for leaves him and moves on without him. All his relationships are short term. He's screwed in the head.
And this is brilliant! Very good points.
To Xartyve2; you sound like the classic offended nerd. Though I do not think you have any reason to be, as the revival is very good. I'm one of those people who only watches something because I think it is good. A snob if you will. And the showrunners, actors and producers on the revival have all made some really good TV, and shown and unprecedented level of respect and understanding of the original series.
I mean that in the sense that they kept the continuity, the same exact premise and the art design which is saying a lot when you look at today's "reboots" and "re-imaginings" that have no plan whatsoever to do anything other with the original ideas than steal some brand-recognition and completley miss the point. The fact that Who is a part of UK-culture has really given them a sizable budget and the freedom to pick and chose the best storylines, guest stars and writers they wanted. It wouldn't have been nearly as good if it was a new, perpetually dieing show on SyFy. The fact that something so nerdy and brilliant is so popular is a small miracle to me. It kind of gives me hope for peoples sensibilities. Normally us nerds might be watching something like Star Trek, Firefly, Fringe, Community, My Little Pony, Avatar: The Last Airbender etc. and everyone else will be saying "Wtf?" while they consume American Idol and The Housewives of Jersey Shore. But Doctor Who transcends that in the UK. It's just
fantastic (thanks 9). Everyone else are for once (for some insane reason) also in on the fun, and the show is much better for it.
Now for the show itself the people working on it clearly put
a lot of effort into it. A friend of mine had been saying for 6 months: "You
have to see Doctor Who!" before I finally could tell her I had the time. It surpassed 6 months of hype easily. I did not know what I had been missing.

Also remember that the revival hasn't done anything to the original series, which you can still enjoy. Star Wars fans can at least claim that the Prequels really tainted the brand they had been worshiping in public for so long. If anything the revival has made Who more relevant and popular.
