No because white isn't anything like an ethnicity, white Americans are a mix of many different ethnicities including about 10% African. In Europe we don't have white people, we have Germanics and Slavs and Celts.

Is white a unifying culture in anyway? Wouldn't calling it Europeans and their diaspora make more sense?

Can it happen? Yes. They're called churches and family reunions.

Short answer: NO. Because ‘white’ is not a culture, and because ‘white’ people were, and sometimes still are, racist assholes.

Long answer: So the reason black people (in the US especially) have an aggregate conglomerate group identity is because they were brought over as slaves, seperated from all their family, and basically had their own cultures beaten out of them. They had to rebuild their cultural identity from scratch.

‘Asians’ tend to not have a bloc group identity except when they get together as a bloc to stand up to white people being assholes (again, yay racism). Individual cultures did, in the past, have insular cultural communities (again speaking mostly US-centric) because ‘white’ people in the US didn’t want ‘those icky non-whites’ living near them (to the point of codifying it into law in many cases). They had to create their own communities in specific ‘permitted’ locations, based on nationality (hence the development of ‘Chinatowns’ and such).

‘White’ people, on the other hand, moved to the US voluntarily and were able to keep their cultures intact and plop them wherever they felt like. So it’s disingenuous at best and outright racist and belittling at worst to claim a ‘white’ identity because ‘black people get to do it’, completely ignoring the fact that black people only do it because people labeling themselves ‘white’ forced them into it.

Edit: adding to this, it is possible for ‘white’ people to have a cultural identity. For example, my family all came from Sweden, and for quite a while found comfort in hanging out with fellow transplants from the home country while we learned the language, found jobs, and such.

As a result my ancestors built Swedish halls, held Swedish festivals, and so on—in fact we still do today, to celebrate our heritage. But we are celebrating Swedish heritage.

Depends a lot on "where" the community is.

Most communities aren't based on skin color, rather mainly based on shared language, shared culture or shared religion. Hispanic communities can have people from a number of Latin American countries, like Mexico, Colombia, Bolivia, Venezuela, these can include people with white skin ('murican racism is based a lot more on xenophobia than actual skin color). Brazil has some germanic communities in the state of Santa Catarina, but you can also find people of Polish and Austrian descent there, these are all super white, as you'd expect, but not hated for being white, although the density of nazi sympathizers there is significant.

Most black communities in the Americas formed either from populations of freed slaves or from their resistance settlements, so they often didn't "share" a culture^[slave owners figured out the hard way that having too many slaves from the same region made it easier for them to organize and revolt], but shared that common background of slavery. Not only that, they were often shunned and hunted by the white society, thanks in no small part to racist propaganda. They were more or less forced to live in their own "black only" communities.

Lastly, there are small european communities in places around Africa and SE Asia, like in India and Taiwan. These communities will tend to be "white" for the same reason hispanic communities tend to be hispanic, or arabic communities tend to be arab: because the people that plan to join them often share a common background and, since they'll be strangers in someone else's land, it's better to have a group you know to help you get started.

If the majority of your community already is white, doesn't that satisfy whatever urge that is? Why would there be a further need, if there are many white people in your community already, to have an exclusively white space, unless you are a racist? The point of POC communities is to connect with people who face the same struggles in society as a racial minority, so would the point of a group formed by a white majority be to unite under the shared "oppression" of a majority?

No. And they all have the same problem of radicalization too.

They really cant help themselves, its so ~~on~~ below the nose.