Why do "sum" Filipinos develop "selective" amnesia when they get back from a vacation in a foreign land?

Like hello, two weeks ka lang sa Hongkong inglisero ka ng hinayupak ka! Ang plastik! At ang taas pa ng kilay mo! Acheche!
Update: @Japs
Miss the old Yappers like crazy! You still definitely have the wits in you that I used to like many years back.
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