Here's the truth with all this hairstyle/hat/glasses goofiness.
The shape of your noggin and your outer ears contribute DIRECTLY to what you perceive as normal sound. If you change these things, you will hear differently.
Wearing a hat changes how things sound, and since I don't usually wear a hat, I choose to not wear it when I have to listen closely.
I suppose that if one wears glasses, depending on the size of the frames, it could have some effect on what they hear, but if they wear them regularly, they're used to how the world sounds with them on.
So really, it's not THAT ridiculous.