Tenant accusing me discriminate them

[Tony Huynh]

We have been rented out without really doing any professional background checks until I read Brandon's book and understood how important it is to background check a tenant professionally. 

Problems arose when the new tenant said that the current tenant (who is his friend) did not have to go through a background check but why did we have him go through a background check? The new tenant accused me of discriminating against him somehow but I did explain that this is our new policy that we starting to apply and it does not have any personal against him. 

Should I be worried about this issue or is the new tenant just sensitive?