The Fifteenth Day of Winter

I've experienced quite a bit of the famous Midwestern friendliness since moving to Wisconsin, but curiously, I find it distinctly lacking when I'm riding my bike.

No one nods.

No one returns my smile or my mouthed good morning/afternoon.

No one calls out they are coming when they pass from behind me. (Yes, I'm slow.)

What's wrong?

Is my winter riding gear really that frightful?  I'm not even wearing a ski mask. (Yet.)