You appeared to deny that her being a woman would have anything to do with them losing, that Biden's being garbage would be enough. Maybe. I'm saying that her being a woman may contribute to that, and, let's see how the media handles her after a debate. She's no more vicious than most men, but she'll be portrayed as mean, vicious, &c.
Biden was picked for Obama's VP because he is white and male.
Biden was picked this time because he is white and male.
America prefers white and male.
Racism is everywhere.
Ok, but I'm still not seeing how what I said has anything to do with a Pence vs Harris debate.
As for the rest of your post, I mostly agree. However you have to take into account that Biden is a ho hum candidate going up against an incumbent who has overseen a relatively good economy (for the investor class, at least). So he is already at a disadvantage to begin with.
Now, if you were comparing a rockstar Dem candidate with a black female VP losing, especially after 8 years of an RNC presidency, then you could certainly have a strong argument that race was a primary driver, because there you would have a more level playing field that would favor a Dem victory in the absence of a black female VP.
That said, Trump has certainly lost some ground because of the Rona and Floyd/BLM, so that could help the Dem ticket.