When you export the project list, it will include the customers, Bparnell. Although, you can manually hide or delete them in Excel. 

I'll walk you through with exporting the list:

1. Click Sales.
2. Go to the Customers tab.
3. Click the Export icon next to the Printer icon. 
4. Click Enable Editing so you can make the changes. 

I'll also add the article on how you can export reports, lists, and more for better guidance. 

You can always visit the Community if you have other reporting concern.