Riding vintage bikes, I am frequently passed by riders on modern ones. I find the "click" of the cassette on carbon fiber bikes to be quite loud, louder than my old freewheels. It isn't so bad on aluminum frames, but the carbon ones sound like plastic when they are coasting. I don't like that sound.
Nothing like the sound of riding a vintage steel bike with the wind at your back and hearing the wheels hum on the pavement. It doesn't get much better than that.
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1971 Paramount P-13 Chrome
1973 Paramount P-15 Opaque Blue
1974 Raleigh Professional Blue Mink
1991 Waterford Paramount
Holland Titanium Dura Ace Group
Holland Titanium Ultegra Triple Group