I fully understand as my son who is in P3 is the same. Sometimes i wonder if it's a "boy" thing or what! Days like this makes me wish i can stay home and teach him more as by the time i am back, it's late. But what to do, have to work.....
Well, I don't think it has anything to do with "gender". It's the attitude and habits that have been formed since young. That means, they can be changed or developed...(unlike gender)
You may want to spend more time with him , not just to teach him schoolwork but to help him form good attitudes and habits too.