Is ethnonationalism inherently racist and/or hateful?

No.
But ethno-nationalism provides the ideal conditions for separatism, xenophobia, jingoism, narrow mindedness and race hate to flourish.
As do many identity politics dogmas.

Decent response.

Do you think that someone can advocate for an ethnostate without being racist or hateful?

In theory, possibly but presuming an ethnostate is presuming supremacy of your ethnicity and presuming something wrong with other ethnic groups, no?

Not always, imo.

I think someone can be an ethnonationalist in the sense that they are a "white" nationalist for "white" countries and a "black" nationalist for "black" countries - so they don't believe any race/ethnicity to be superior, but have an ideal view of how countries should be run.

I'm going by the definition of racism as race hate.
It is possible but will hinge upon the motivations and tactics for advocating an ethnostate.
Some countries like Japan & North Korea have very strict immigration laws and will only grant citizenship based upon paternal descent or ancestral bloodlines.

This.
I think most of the people who advocate the idea of ethnic nationalism are basically racists looking to make their views seem more respectable. People who go on about 'white nationalism' for example tend to be thinly disguised neo Nazis, white supremacists etc, a lot of black nationalists also have some very dubious views. I can think of a few circumstances where an ethnically based state can be justified though, a good current example would be the Kurdish liberation movement. Also Israel, yes I know there's people within Israel who use nationalism to justify racist views/ policies but I support the idea of a Jewish state and think a lot of the criticism of Israel is way out of proportion when you consider the surrounding countries have much worse human rights records.
I've heard about how strict the immigration rules are in Japan. One of my friends has spent time in Japan and was talking about how she'd researched the possibility of getting permanent residency and how difficult it was. I doubt immigration's much of an issue in North Korea though, I think it's more a place people want to get out of. Well, there might be a few delusional people who like the idea of living under hardline communism and see NK as some sort of utopia. I think they'd change their minds very quickly if they actually experienced it for real though.

Coming from a mixed race guy, I am a fan of ethno nationalism. I wouldnt want japan to be the land of jamaican people or jamaica to be the land of british people. If i wanted to visit france, i'd expect and hope to see ethnically french people, not arabs haha. A british country should be predominantly british people in the same way that nigeria should be predominantly nigerian people. Absolutely nothing racist about it but i can see how people could twist it for their own racist agendas.

Coming from a mixed race guy, I am a fan of ethno nationalism. I wouldnt want japan to be the land of jamaican people or jamaica to be the land of british people. If i wanted to visit france, i'd expect and hope to see ethnically french people, not arabs haha. A british country should be predominantly british people in the same way that nigeria should be predominantly nigerian people. Absolutely nothing racist about it but i can see how people could twist it for their own racist agendas.

I see what you're saying, and I would expect the same. Pure ethnonationalism simply means you believe your ethnicity should have an identity, which makes sense. The only problem is that a lot of the time, ethnonationalism goes hand in hand with advocacy of an ethnostate, which is basically the purest form of racism. You could argue that an ethnostate isn't technically racist on their own, but why else would you want to keep other ethnic groups out if you didn't think there was something wrong with them?

there are ways around it. ethnic minorities could be encouraged to not breed by being offered money if they dont have kids in the country. is an ethnostate just a country with 100% just one ethnicity? like immigrants arent allowed whatsoever?

Yes, an ethnostate is a state for one ethnicity.

The way you talk about ethnic minorities makes them sound like animals. 'Offering money if they don't have kids' sounds like something that would be in a certain group of laws named after the German city of Nuremberg. Not sure why someone who has partial background in a minority would ever support something like that

I see what you're saying, and I would expect the same. Pure ethnonationalism simply means you believe your ethnicity should have an identity, which makes sense. The only problem is that a lot of the time, ethnonationalism goes hand in hand with advocacy of an ethnostate, which is basically the purest form of racism. You could argue that an ethnostate isn't technically racist on their own, but why else would you want to keep other ethnic groups out if you didn't think there was something wrong with them?

Discuss.

I don't think that advocating for an ethnostate is inherently racist. As I said somewhere above, I reckon someone can be both a "white" and a "black" nationalist at the same time - so could argue that every ethnicity needs an ethnostate. Imo it is not racist or hateful to believe that ethnic groups need their own identity and their own countries in which that identity can thrive.

I'm not entirely sure that multiculturalism works, and it's my view that different cultures are at least somewhat a result of different races/ethnicities. I'm not proposing the idea that an ethnostate will solve all of our current societal problems, however it's easy to see why some people would think that - and I don't believe it to be a racist proposal either.

An ethno state is racist by definition as you are ascribing social traits to races whole race collectively.