I've heard people say stuff like this, but I really don't think this is true. I do think people prefer to live around those they grew up near and who, generally, hold the same basic values. This doesn't necessarily mean they're the same ethnicity, and it also doesn't necessarily mean they have entirely the same culture. For instance, I wouldn't want to live near some white dude swinging around a Confederate flag or spouting off about LGBT people committing sins or whatever.
However, IMO this is an argument for diversity. When children with parents of different ethnicities and cultures grow up together and interact, presumably their views and beliefs will be something of a mix of their parents' and those they grew up near (perhaps with the exception being if the parents are obscenely racist or something like that).
Likewise, I don't think there's a limit to celebrating "white culture" (I'm assuming you're mainly talking about celebrating stuff from various European cultures). I do think some people take their opinions too far and demonize white people (this happens in the other direction too, of course), which is obviously not good, but IMO this is the exception rather than the norm. It's just that the exceptions tend to be rather loud (especially on social media).
