Upper and Lower Case Debate

One day this week we were in the car and Spence said something funny. This was our conversation:

Mommy: Spence, you're silly with a capital S!
Spence: What is capital S?
Coleman: It's upper case like your name starts with.
Mommy: That's right Coleman!
Coleman: Upper case is big and lower case is little.
Spence: Then I'm lower case 'cause I'm little.

I have to disagree with him. His personality is so big that we should use all caps to spell SPENCE!