Can a non-black person explain something to me my white coworker said...

For context I am a black man 46. I have a white coworker that's 50, we are friendly but wouldnt really call us friends. But we enjoy hanging out while at work. Also for context he is a big biker guy tatted up big beard and balled head. We talk about all kinds of thing including race relations time to time.

Also for context we live in a major city in Kentucky. So while the state is deep red our city is actually light blue.

From our conversations over time I have gathered he grew up being told there are separate races and they should not mix and that (in his father's words) his whiteness is his acceptance.

His 20 something son married a black woman. While he was accepting of it. The sons brother, grandfather, and various other family cut all ties. And also with my coworker for accepting it.

He said he was told by his family members that his generation and younger being OK with interracial marriage is whats wrong with this country. They "gave it away to the blacks fucking our white women, the gays getting rights, the Mexicans taking our jobs etc". He said in conversations with other white people, there a growing feeling that whites are now starting to actually feel their "loss of standing for simply being white".

My questions to white and non-black people is this something you have encountered in your families or people talk like around you simply becasue you are white? As in is bigotry by some a common thing when no one of another race is around? Even if you don't share their beliefs. Also have you heard anything about the white race being phased out by interracial couples and LGBT.