Much has been made of Gennady Rozhdestvensky’s refusal to conduct the Boston Symphony last week after discovering that his name was in small print on a poster. But Jeremy Eichler says that the BSO has “a deeper problem of… condescending to a potential audience. If the BSO had the artistic vision to bring Rozhdestvensky to its stage, it should have had the marketing courage to stand behind its reasons for doing so.”