Are you talking about if the earbud is playing music, or just placed there?
If playing music, it should be obvious that it would be harder to hear someone over music playing.
If you just there, you are still blocking 1/2 of how you normally hear, so again it should make sense that it isn’t as easy. Your 2 ears work together to figure out where a sound is coming from for instance (can still do with 1 ear, just not as accurate and only on that side).
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