This is happening between Palestinians. You can call them Arab Israelis if you want but they still identify as Palestinians. Splitting them up for the sake of division with these policies is political and systematic.

And yes a double standard applies compared to other countries because Israel identifies as a western liberal democracy whereas the others don’t or no one implies that they seriously are.

Main problem here that if Israeli citizen will decide to marry a Lebanese, or a Jordanian, or an Egyptian or even Saudi citizen, they won't be able to live in Israel.

Outrage of non-Israelis about is law is merely academical. Outrage of (some of) Israelis is practical: the state is putting a choice in front of a citizen -- be able to marry a person you want or be able to live in Israel.

Why is it not a problem that they won't be able to live in Lebanon, Jordan, Egypt or Saudi Arabia? This outrage looks like a double standard to me.

Because I'm not a citizen of Lebanon, Jordan or Egypt. As an Israeli citizen I share the responsibility and am obliged to react to any colonial era exercise the government is trying to pull off.

That doesn't excuse applying double standards.