Why do you doubt it?
In the vast majority of cases, it’s a purposeful act to marry outside your race. A way of making a statement about race - usually self-serving.
The way it is being pushed nowdays in entertainment shows and ads, it’s become a fashion statement.
Actually, MANY marry outside their race without blinking an eye. Asian-white. Hispanic-anyone. But there is one color that doesn’t seem to mix well with others - UNLESS they came from Africa. From the few I’ve known, folks from Africa who come here “play well with others”. Of course, none of them majored in “Entitlement Studies” either.
Back in the old country, Jews and Gypsies were considered separate “races” but here in the USA they are white as a Swede.