Can you be TOO culturally intelligent?

I recently read an article that has got me thinking - is it possible to be too culturally sensitive? Author Dr. Bob March describes his friend who had learned Japanese language and customs so well that he actually offended his Japanese counterparts by acting too Japanese. Here's the article: http://www.negotiations.com/articles/appropriate-behaviour/

This has happened to me too. I was an exchange student 20 years ago from the U.S. to a village near Nijmegen in the Netherlands and still regularly speak Dutch (with a little Nijmegese accent) with friends both in the Netherlands and also in Denver where I now live.

Dutch (and Flemish) people are often grateful when a foreign visitor learns even a word or two in their language, and even more so when someone has taken the time to become fluent. But perhaps people have gotten too comfortable with my language that they've categorized me as in some way as Dutch. So... when I can't quite think of a word or mix up grammar a little, the person often looks at me like something's not quite right.

There's a Dutch group that meets in Denver. It's a great group of people, who mark major Dutch holidays together (Queen's Day, Sinterklaas, etc.) along with showing Dutch films and eating Indonesian food. I've participated many times in the past 4 years and enjoyed the group's company. But there's always a little hesitation by certain group members to say - you're not really Dutch, are you? No matter how much I know about the Dutch culture, it's never quite enough for some I think to feel comfortable with me.

So now that you know my perspective on this topic, I'd be very interested to hear about other people's experiences after cultural immersion. And... is there such a thing as being TOO culturally intelligent?