Why would you ever come to such a silly and stereotypical conclusion as thinking that all Japanese people or the entirety of Japanese culture is somehow anti-"throwing"?
You live here. Have you not seen _countless_ Japanese people playing baseball/basketball/soccer, Japanese kids playing with balls, etc. etc.? Does it seem like the act of throwing in and of itself is something Japanese people are universally and uniquely unable to grasp?
I have no idea what sort of situation this happened in, but _many_ people (not just Japanese people) are going to be freaked out if you just throw an object at them, or in a situation (e.g. in an office, at the dinner table) where it's preferred to hand things over in a civilized fashion.
Of course, I'm not saying that Majestic's point(s) are invalid, but the very premise of the question seems ridiculous to me.