Well if that what really matters to millions of others and they didn’t care about the economy—foreign policy—energy—SCOTUS etc etc which should be enough for anybody with brains then they are DUMB
It's called the straw that broke the camels back. They are not turning on Obama ONLY because of his coming out... this was just the last straw. ALL of the things you mentioned bothered them too, but for some those alone weren't enough (especially when blame for many of those things is so hard to place solely on Obama)