From my own anecdotal experience, everyone I can think of who is gifted (rather than clever) has social troubles to some degree, one of my sons included. He finds it difficult to relate to most children as he largely speaks a different language. He's a 99th percentile in most areas.
However, unlike the kids in the article, he doesn't enjoy Shakespeare or fawn over Incan currency. Talking to him is amazing. His thought processes are very mature, even compared to many adults. His language (when not telling fart jokes) is eloquent. He has no choice with his peers: dumb it down or be a freak.
Several of my friends fit into this profile too. None of them fit the mould painted in this article. Although, that doesn't surprise me. I found this article disappointing on several levels (eg. generalisation about gender is 'she').
There were a few points in the article that resonated with me: behavioural problems in my son (which we later categorised as Aspergers compounded with boredom) and misdiagnosis by teachers. My son was put in a special class for struggling students until I produced a WISC report showing he was gifted or near gifted. When he wrote a beautiful children's book at 5, they thought it was a forgery and ignored it until I had the WISC report to confirm his ability. The report changed a lot with his teachers.
The article talks about segregation as a positive. I'm not convinced this is a positive as these children are likely going to need to integrate in broader society. I purposely put my kids at a standard but high performing school rather than choosing a special school for this reason. The results have been mixed. There is bullying by peer girls and boys and at least one 'friend' said "my mother can't see me play with you or I'll get in big trouble" (also known as Aspergers are lepers to some parents - if this is true, she is an awful person).
If I have one suggestion for parents of a gifted child, it would be to accept that your child will have areas where they are smarter than you and to nurture their talent through their interests. I've recently observed at length two mothers with near gifted or gifted sons whom they mercilessly bully (I have no idea why a parent would do this to their child). Both mothers have a daughter too - and the daughter (in both instances) can't be praised enough. Two of my closest and gifted friends (50+) recalled similar bullying from their mothers (and were unsupported by weak fathers). Thankfully, my wife is not like that with our son.
So, yes, I see odd behaviour from gifted children as normal due to an incompatibility at an intellectual level. Gifted is noticeably different from clever. When you talk to a 5 year old that shows complex reasoning like an adult most of the time, they are most probably gifted. Someone that knows some surprising facts is probably clever rather than gifted.