I don't think either of those stereotypes hold up to scrutiny.
Also, watermelon is loved by many people all over the world.
Also, there is this sort of a summer beach activity in Japan called "Suikawari," (スイカ割 translated as watermelon splitting) which is where a watermelon is laid on a a tarp and people have to try and break the watermelon with a stick while blindfolded, but before they hit it, they have to spin around in place a few times.