If that is YOUR culture and belief what gave you the right to impose it on her and call their union “Trash” and “ a waste” let HER live her life.
She doesn’t want to be a bigot like you so don’t shove it down her throat.
Such a silly logic
Honey, I’m Slavic. Our culture strongly disapproves of this—it’s against it. Many of us, from the time we’re teenagers, are told by our parents that we should only date people like ourselves. We don’t want any mixing of races—especially not with "brown" people. We don’t want people pointing fingers at you, saying, "Look, she had a child with some brown man." We don’t want our grandchildren to look like children from third-world countries.
In Slavic countries, if you have a child with a man of color and then split up a couple of years later, you will never again in your life be with a "normal" white man—only men like the one you were with. Men in Slavic countries tend to be very strong nationalists. So, don’t blame us for this kind of reaction; we were raised according to these principles.