Zionism is an inherently nationalist ideology (and mostly an ethnonationalist one). Supporting mass immigration in Europe but not in Israel is hypocritical. Supporting big, beautiful walls in Israel to keep illegals and enemies out but thinking Canada and the U.S. should take in millions of immigrants is also hypocritical. That's basically all he said. I fail to see what's racist about it. It is correct.
Admittedly he said some more things regarding anti-Zionism not being anti-Semitic that I disagreed with, but that was not racist either.
Irregardless, Morty is clearly racist. He's argued for eugenics before on top of all his other comments.
If you support laws against cousin marriage, you are a eugenicists.