@synlogic He is an old friend of the family (has been over to eat dinner with my mom and dad multiple times). So i am admitidly bias in the sense that I have some sense of him that others may not from the media.
That said I do feel his racism is transparent even if one reviews his public record. 1) he started his career and spent most of the initial part of his career fighting to keep segregation alive. He specifically stated the reason was because he didnt want his white child going to school with other minorities in what he deemed (his words) a "racial jungle". So its clearly established he has deeply racist roots that defined much of the start of his career.
Later it becomes more subtle. Afterall Biden like any smart politician will do what he needs to remain in power. So once racism started to become something that hurt him he moved from oppression to exploitation. Now he exploits minorities by giving them oppertunities (for example in cabinet roles) that are still subservient to him, but such candidates would be a fool to decline for career purposes. In effect taking the "im not racist i have black friends" approach to racism by exploiting them to make himself look good.
It is obvious all the smae underlying racism remains, however, based on how he speaks. For example the famous line he made just a year or two ago "If you dont vote for me, you ain't black" when asked about black voters who dont like him. This is revealing for two reasons 1) he thinks he knows better for blacks what is good for them than they even know themselves, and disagreeing with him, a white person, on whats best for a black person would mean you loose your black card (whatever the hell that means). and 2) his use of broken english "ain't" a word he never normally uses shows that he relates black people to being uneducated and he felt that by expressing himself in broken english he would appeal more to black people, clearly showing his racist way of thinking.