As I ride almost exclusively on bike paths/trails/MUPs, I rarely encounter anyone who doesn't acknowledge me. I also rarely encounter anyone riding a road bike in typical road kit. But of the people I encounter in that select group, I'd say about 75% of them do not acknowledge me, as compared to about 5% of all of the rest.
However it is a small sample size. I doubt I have encountered more than 20 people on road bikes wearing road kit over the past 2 years of riding trails.
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"Too often I would hear men boast of the miles covered that day, rarely of what they had seen." Louis L'Amour
There are two types of road bikers: bikers who are faster than me, and me. Bruce Cameron - Denver Post