Israel gotta go

No.

Netanyahu gotta go. Don't condemn the population of a country because of the actions of its leader.

Netanyahu will just be replaced with another genocider in a long line of genociders, stretching back to the Nakba. If you try letting up on the genociding like Yitzhak Rabin, you’ll just get whacked and replaced.
I hoping the OP means the state of Israel "has to go," and not necessarily the population. I.e. a "one-state solution."
Israel exists as a terrorist state residing on stolen land.
Condemning the state’s existence isn’t condemnation of its citizens any more than condemning Amazon is condemning all Amazon employees.
Israel needs to go.
Israel is a settler colony and an ethno state. It doesn’t have a “population”, but a settler regime.

Vatican City is sweating...

Along with basically every Asian and middle eastern country, several European and African countries, and a few South American countries. There are a lot of ethnostates in the world.
In fact, I’d say most countries outside of the EU/the anglosphere are a lot closer to being ethnostates than they are to being any sort of cosmopolitan melting pot.
But most of them have been that way for a long time so people just accept it.
- An ethnostate isn't just a country with a majority ethnic group.
  It has to explicitly give legal preference to one group over another.
- Yeah there are a lot of ethnocracies. Turkey being one of the most obvious examples. Even within the EU you have countries like Latvia or Estonia who have been labelled that in the past.

Strange take. Presumably if Israel was replaced with a non-ethnostate, Jewish citizens of that state would get the same rights and treatment as every other citizen.
- Exactly.
  If the USA tried to again be a White/European ethnostate and allow anyone with Caucasian heritage to immigrate and barred everyone else from immigrating, then no one today would accept that.
  And if they went full on apartheid and started putting natives and minorities in locked down ever-shrinking reservations, people would really lose their shit.
  When white nationalists try to advocate for such policies, they are rightfully criticized for being racist.
  I can never understand why Israel gets special treatment in that regard.
- Tell that to 1930s european jews Or 1950s arab jews
  People just hate jews, man.
- But literally no one with power in the current situation wants a non-ethnostate.
This is a Hasbara take on things. The white people from South Africa didn’t disappeared after the apartheid state got dissolved. There were Jewish people in Palestine before Israel was established. Palestinian people have never had an issue treating Jewish people as equals. The only apartheid state in the region has always been Israel.
- The white people didn't disappear alltogether, but a lot of them did emigrate. Jewish people are kind of unique in the way that they face hostility everywhere outside Israel, so that's not really an option for them.

United States of Israel

Nuh-uh. Organic/long established ethnostates may be frowned upon, but if they close off their borders to preserve their identity, that's their right, since I belive in the self-determination of peoples.

It is arguable though, whether these even exist right now, or are there only nation-states and some wannabe ethnostates.

Trying to violently establish an ethnostate is of course something I cannot agree with.

close off their borders to preserve their identity
If your ethnicity is your identity, you're by definition a xenophobic bigot.
since I belive in the self-determination of peoples.
Except for people who want to move to the ethnostates you support, of course 🙄
Trying to violently establish an ethnostate is of course something I cannot agree with.
You literally can't establish and maintain an ethnostate without the use of a lot of violence and oppression against people of other ethnicities. That's just how the world works.
- Ethnicity totally can be part of an identity, but that doesn't mean you have to hate anyone.
  Don't misunderstand "closing off borders". Making the people stay is not okay. Not letting the people that left back is also not okay. Not letting in a different ethnicity? Arguably racist, but I wouldn't count not letting them into your country as oppression. I'm a christian, so I can't visit Mecca, yet I don't feel oppressed.
  That's why I said "long established" and that's why I pointed out that those aren't many. I don't think the violence you'd have to use to establish an ethnostate is in any way acceptable. If the ethnostate already stands though, you may use certain tools to preserve it, which are not many and are usually "not enough".
  My take wasn't that ethnostates are good, but that they are not inherently bad either, it's just the tools usually used to establish and preserve them that we must condemn.