"Gaijin ga Kusai"

"Gaijin ga Kusai"

I often go for a walk. I don`t smell (to my knowledge) I am clean enough--showered that day. I don`t wear cologne. And as my Japanese
listening ability has gotten better, I swear I hear the word "kusai,"
often right at the moment when I am passing (usually two) young guys either in their teens or early twenties. The word is usually said
in a kind of muffled manner and it is said suddenly, right when I am
abreast of them (right when I am passing them).

The young guys are usually very small. I don`t usually hear it from
young big guys. It is usually young tiny guys that say it.

This phenomenon doesn`t seem to occur when I pass men in their thirties or older, tall men, and I have never heard a Japanese woman utter it when I pass them. I have never heard children utter it
when I pass either.

But it does happen once or twice a year when I pass young Japanese men
often in a pair or more--never alone, and they are usually under
5` 7."

Do young tiny, Japanese men have especially sensitive noses? Or could I be all wrong? Does the particular gaijin aroma waft downwards to the noses of petite Japanese men?

Does anyone else experience this interesting phenomenon?

My Japanese wife doesn`t mind my odor unless I have eaten Mexican
that day, then the whole house minds.....