If it's raining, most people will go inside and not eat in the succah. If, however, someone chooses to stay and eat in the succah, must they stay in the kosher part, or is it OK to go into a non-kosher part?
It seems that since it's raining, there would be a ptur (exemption) from eating in the succah. But perhaps by staying outside, this guy negates his p'tur and must stay in kosher areas.