What'd you say?
I could hear you typing that.....
Some times our perception / selective hearing deceive us.
I think I can only capture 30% max what my wife say... So I guess our ears being a great device, our brain keep failing us all (or the brain serves us well, which ever way you want to look at it)
The brain serves us well. For example, you don't feel your clothing touching your skin all throughout the day, and you probably didn't notice until I just brought it up. Yet, now that I did, you notice. If you noticed things like that all the time (that is to say, if the brain didn't filter and attenuate chronic auditory and tactile stimuli), it'd be sensory overload. We'd all lose our damn minds.
That's definitely not a problem with your ears.