Japanese culture - Japanese and blood type

Most of Japanese people know their own blood type.  The blood type topic is an everyday conversation in Japan.
Why? - because personality depends on your blood type and they believe it.
It started around 1930 and the Japanese embraced the idea of matching personalites with one's blood type.
This blood type distinction almost seems like a superstition for western people, but this is right !!
For example, when you go to party and starts talking with somebody.  - "What is your blood type?"
-This is a common conversation to get to know each other.  -"Oh, AB?" and then the girl will think(-he won't match with me!")  -{ Sorry, this came from my experience - I never had a date twice with AB type guy.  - they just didn't match with me}
 If he answered "Mine is A" - I thought "Perfectioniest! - so you care about small things don't you?" - I dated with blood type A guys but none of them lasted long.

My friend has every blood type in her family.  O, A, B, AB - Her family is very unique and each one has their own personality that matches their blood type.  Tell the truth, I don't know how she handles life with those different blood types.  
My family(in Japan) is all blood type O and my family in here is all O, so we are sooooo SIMPLE.

 I will explain the personality of each blood type, but remember, this is coming from me ( O blood type ).

A
Calm, high standards(Perfectionists) - They are really strong minded.  Type A is artistic and can be shy,
conscientious, trustworthy and sensitve.  They tend to avoid confrontation and feel uncomfortable around people.  They are a perfect employee and student type - but not that fun to be with.

B
Always my way-blood type.  Looks like they are not strong-minded, but they always like following their own rules and their own ideas.  Self centered, following its impulses, and feelings regardless of the consequences, but these blood types are fun to be with.  Unpredicability, Optimisum. They change their mind quickly.

AB
Like an alien - mysterious. They are hard to categorize and understand.  They have a character of A, B, and AB.
rationality, coolness, sensitive, careful, moody, negative.  They don't mind doing favors or helping out as
long as its on their own conditions.

O
Simple !!  Outgoing and very social, creative, popular, love to be center of attention and self confident.
Most flexible type - it seems like matching to every blood type person(surface) even they don't like that person.  Easy going.  Totally different of blood type A - They are not a perfectionist but they think they do things perfectly.
O is very real fun to be around. They have a warm heart : )   O is the greatest!!!  Yattane !!

I don't know this fits to western people, because most of the people don't know their blood type.
If you have Japanese friends, why don't you ask their blood type?