Economic boycotts, divestment, sanctions, including cutting military aid to Israel are all appropriate. But cultural boycotts are no different from Israel's own acts of banning Noam Chomsky. You can't blockade ideas. You shouldn't blockade the people who express them.
Law expanding definition of terrorist activity passes first Knesset reading (Haaretz)
from the article: Unofficial Bob Dylan website bans Israelis in wake of Gaza flotilla