I live in the Philadelphia suburbs and commute daily to work on the train, and very often read my Cybook. I've seen one woman with a Kindle at the station, but when I tried to strike up a conversation about it, she gave off a real I'm-reading-leave-me-alone-you-weird-geeky-person vibe. I have seen her several times since then, but I leave her alone now. Hello people--if you have an ebook reader, evangelize! I've also seen a woman reading a Sony Reader several times.
One of my co-workers (who commuted via train as well) purchased a Kindle. She has since left for a different job, which involves a train commute from south Jersey to NYC. Another co-worker purchased a Kindle, on my recommendation, for her husband, who travels frequently and uses it for the Wall Street Journal and other subscriptions, which is why I recommended the Kindle for him.
I don't fly that often, but went on a trip from Philly to Chicago last month. On the way out I had the row to myself, but someone asked me about the Cybook at the airport. On the way back, the woman in the seat next to me asked about it, and I gave her a demo.
So if this guy isn't seeing people with ebook readers, Kindle or otherwise, on public transportation, he can't be looking that closely.
I am often approached in restaurants and on the train and asked about my Cybook (usually I get, "Is that a Kindle?"). I always answer questions and give a demo. And I always tell them to check out mobileread.com.