It's just not true.
Summer is full of things to do.
Good things, but things none the less. You've got your cookouts, family reunions, high school reunions, county fairs, camping trips, summer vacations, trips to the lake, gardening, house maintenance, summer camp, tee-ball, softball, volleyball, etc. The networks don't even put anything good on television. Because we're too busy to watch. Lazy summer, indeed.