On Monday night my seven year old grandson was carrying on a bit at bedtime, disturbing his sisters and generally playing up. In quite a firm voice I said that he should go to sleep, that it was very late and he would be very tired when he had to get up for school. His response was "I don't like you grandma" I told him that made me sad but that I still loved him loads and loads.
The next morning getting ready for school he whispered in my ear (so his sisters couldn't hear) "grandma, I really do love you, I was just pretending that I didn't like you last night"
I said "It's okay, I knew that" and we shared a lovely smile.
Little children seem to know how to tug at the heart strings BobbityBoo and unless it goes on and on, or gets nasty, I wouldn't worry too much. Just keep re-assuring him that you still love him no matter what.