Why does Japan care so much about Blood Types?

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One note for those interested:
@4:27
-For type O's 「きかぬ氣の人」was translated as "inconsiderate," but persistent, stubborn, or more positively - "strong willed" would be more accurate. (似た言葉➡︎義強 意地張り 情っ張り 意固地 頑冥）
-For type A's 「引込思案の人」was translated as "self absorbed," but it should be "shy" or "withdrawn." Literally "withdrawn thinking person".

TRANSCRIPT with links and sources: https://www.patreon.com/posts/20461879