One in five Israelis are not in any sense Jewish, they are the remnant of the Arab population who did not go into exile.

If the people who went into exile, and their children, were allowed to return home the figure would be round one in two. Insofar as the reason they can't return home is because that would mean it wasn't a Jewish homeland any more, I can't see how that can escape being open to the charge of racism.

Israel has a "right of return" that only applies to people from the Jewish Disapora, and not from the Palestinian Diaspora. Perhaps there may be arguments which can be raised in defence of that - but they would have to be arguments that accepted that it is a racist policy, and found some way of seeking to justify it, even so.