Drawing from the Grandparent thread (WhiteDate and several other "White" sites scraped for data), I think there isn’t a direct problem with some sort of communal “white” culture, though it would much more likely be identified as a general American culture in the USA.
The indirect but huge problem is that most of the “White” culture definitions are based around excluding as many other cultures and philosophies to narrow it down to a very specific philosophy that also includes numerous Christian National, Anti-Women, etc. etc. etc. demands.
You can check on of the associated “white dating websites” that @reply linked too and a small section I quoted from it in the Parent thread, I don’t even want to look at it again.
Or as a further political point, I’ve previously talked about what was to me a semi-valid distinction between Republican Points and MAGA points, but at this point the latter has so taken over the former that it’s functionally a distinction without merit. White culture advocates have pushed the definition of “white” culture so far out of any reasonable norm or definition that their POV has become the new normal. Sure, it’s possible to talk about pride in a specific “white” heritage or traditions, but most people are (correctly) going to be extremely skeptical given how it’s been and being used.
And I’ll mention how a lot of “white” people mentioned upthread (especially the Irish and Scottish) weren’t really considered “white” in the first place in the historical context, so we’re back to not even being able to identify what the hell “white” is anyway!