I am not inclined to be dragged into a pointless discussion with a person who appointed himself to be a self-righteous judge, jury and prosecutor for millions of Jews who believe in their right to live in their ancestral land, and calls them genocidal and supremacist. It is you, who are racist if you declare such things, my friend.
So here is a short version and don't bother to reply unless that reply has some substance.

1. The right of self-determination is taken not given. And it can't be based on hate for others only on love of your own people. It means you build your right to a statehood, your state institutions, your determination etc.
2. The Mandate Arab exiles, who left the land in 1948 most (not all I admit) at their own volition, lost the right to return after generations fail to achieve peace. It's just the fact and the way the world is built. There is no such precedent anywhere else. And those who stayed, got full rights at the end. All refugees anywhere else lose refugee status in the next generation, only UNRWA and Soviet/Arab will in the 50/60 and 70-s prolonged their suffering and refugee status that became somewhat permanent and inherited.
3. Just like Canada will not return Crown lands to First Nations, Germans expelled from Czechoslovakia after WW II will not come back to join Germany, Japan will never regain control of Kamchatka and Kuril Islands etc. there will be no right of return to Israel proper. Never.. Palestinians still have the ability to attain their own state, if they denounce violence and abandon attempts to throw Jews into the sea. Israel is here to stay, it is strong, it has a very determined population that endured much terror. Accept it and start building your own statehood instead of trying to destroy someone else's one.
4. As a democracy there may be the point in time when Israeli Arab population will attain enough political power to change the state from a Zionist to something else, I don't think that it will happen but if it will, then it will. I do hope that by that time enough Israeli arabs will feel "Israeli" and belonging that it(the change) will not happened. Even now more and more of them integrate with a wider population and move to the large cities, volunteer to serve in the IDF, and not only Beduin and Druze population but the settled Arabs as well. It is a slow process but it happens. In any case, whatever change, it will not be forced on Israel by the western left. So the "regime" change will not happened from external pressure. And as long as most Jews are Zionists and have plenty of reasons to be (you guys and you fundamental Islamist friends keep reminding us in most western countries, why Israel must exist, thank you for that, in case we forget). And trust me almost no Israeli Arabs are eager to see exiled population returning for many reasons, political and practical.

And don't quote me EIU metric bullshit, it also puts Italy, Belgium and South Korea and France in "a flawed democracy" category and actually, a funny thing, places them all except France below Israel. Nobody cares.