Racist and sexist

When I picked riley up from preschool today, the teacher informed me he was really good.  In fact, riley was so good he got a "high five" award.  On the way home, I asked him what he did today...he said
"I dressed up like a man!"
"Oh!?  What kind of man?"
"A doctor man!"
"oh cool...did you girls can be doctors too?"
Riley responded with a smug laugh and said "that's silly mommy doctors are men"
Okay...?  Let's move on.
I continued my questions hopìng for some less sexíst answers "when you were a doctor, díd you help any síck people?"
Riley said "well,  I helped that brown baby and stuck it in the belly and It felt better"
Okay...so a less sexist but a lot more racist.  What can I say or do...other than laugh and focus on the positive...like the HIGH FIVE AWARD!!!