prolly the fact that "white" people don't have a shared heritage based on, for example, abduction and forced homogenization like black people in America and "white culture" is largely a racist reaction to black civil rights and doesn't really exist outside of Klan/Nazi/Trump rallies
Now, if you wanna talk about Polish culture or Russian culture or Welsh culture or French or Italian or German or Dutch or Scottish or Finnish culture then hey, there's some stuff you can look up to if you've really got an itch to reconnect with your good European heritage. But if you go looking for "white culture" all you're gonna find is white hoods and burning crosses.