Why did Bob ask me that?

I've been working with Dave for the past 5 months. Recently, I moved into Dave's office for the past 3 weeks. My job has taken a load off of Dave. Dave is leaving his job. We have known this for the past 2 months.
Dave is a white male. Before Dave, Steve was doing the job and he is a white male. Before Steve, Jim was doing the job and he is a white male.

Now, they have hired John to fill Dave's job. John is a black male. I just met him yesterday. We are sharing the same office together. I like John, he is nice.

Today, I chatted with my supervisor, Bob. Bob is jewish male.
Bob is the first person to say this to me:

"Are you getting along with John. Now that you and John are sharing the same office room. John seems like a nice guy?"

Bob never asked me this before about Dave? I did not say anything negative about Dave.

Found it weird that Bob asked me about John.

What is your take? Why do you think Bob asked me about John? I think it was racially motivated.

John is the first black person ever hired there since Bob has been supervisor. 10 years.

I think he asked you that because YOU are probably qualified for the JOB!!! Wanted to know if you felt discriminated against!

I completely agree with mbp! Sounds like a case of gender discrimination, not racial prejudice.

Nah, sounds like he was just making conversation to me. Stop seeing conspiracies everywhere ...

He either wanted to know if you had a problem because John is black or because John is new and no one knows him. Not knowing Bob, it is hard to know what motivated him, but since you know him, I think you are the best person to make that call.