Wouldn't this mean the experiment has been a success? The experiment is "... based around the idea that no single voice can represent the country, so a slew of guest Swedish curators will do the best job to portray the national character."
Take a cross section of any society and you're going to get people of all kinds, including people like Sonja.
The Mashable writer might just be a bit sensitive, I like the Sweden account (and follow other similar ones). Users seem to be free to talk about all sorts of sensitive topics without problem. To me, this week is just an off-week, where I am less interested in the person but will be sticking with it.
"Whats the fuzz with jews. You can't even see if a person is a jew, unless you see their penises, and even if you do, you can't be sure!?"
is "painfully awry" for a twitter account intended to promote tourism to Sweden? What about the tweet about the "hungry gay with aids"?
I doubt those encourage anyone who's jewish or homosexual to visit Sweden.