Japanese like to talk about blood type.
However there is no scientific evidence about this matter.

Every time I hear this kind of story,
I think “Here you go again idiot!”

They repeat same things over and over again.
They just do not have other topic to talk.
They are so dumb that they can’t find other proper topic.

In short,
They are ignorant and stupid and dull people.
At least I recommend you avoid this topic with me ,
Otherwise I start to regard you as one of the most stupid people I’ve ever met.