Whatever

Mr. A has a new favorite phrase - "Whatever, Mom."  He likes to use it when I ask him to do things such as picking up the pillows he's built into a fort on the floor.  He replies with "Sure, whatever, Mom."  Smiles.  And then watches for my reaction. 

Tonight he even followed it with, "I'm not whatevering you, Mom."

I have decided that I will not react or respond to this phase (or phrase), and am hoping that's the right course of action instead of correcting him everytime.  All you super-parents: am I doing the right thing??  Opinions welcome.

PS - on Saturday night, he used "whatever" in his prayers.  it went something like this, "Dear Heavenly Father, whatever."  again, i said nothing, but couldn't believe it had seeped into the prayer vocab!  who teaches him these things??!!