I agree, if it is not offending any-one let him be.
In a similar vein, I once had crew report to me that a pax was watching porn on his laptop! I made my way down to his seat to see what the fuss was all about. It was a B744, so I was able to approach him from behind and observe his actions, he was seated on the aisle. After a short while I introduced myself to him and asked if was a medical practioner. He confirmed he was a plastic surgeon! I told him about the complaint and we had a good cackle, he was just arranging his slides of before and after photos on his new computer! After I explained the situation to the crew member she also had a good giggle with the pax!