In Poland, I would classify myself as maybe a little bit above the average in terms of the sort of honesty described in the article (and that mostly with people I knew very well). Here, if I don't control myself I end up being the awkward says-before-thinking guy...
What bothers me most, however, isn't not being able to speak my mind; it's the lack of feedback from people around me. I am always left wondering if stuff like "I really like your other glasses" isn't actually code for "you look like an idiot in those glasses, and I am embarrassed to be seen with you on the street." I can only hope that with time I will be able to calibrate my sensors for California...
(On a side note, I feel really glad to be married. Dating must be hell in California ;)