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I’ll grant that terms have different meanings in different regions. English is rife with it. But the term “South East Asia” is in reference to the part of Asia, not the direction you have to go to get there. If we went by that then all of Asia would be “West Asia” for me and most of America would be South America.
It’s also worth noting that older humans tend not to hear those sounds as well. This doesn’t explain much, though, because all lot of their other targets hear those pitches just fine.