1. It's you who first made a positive claim that was unsupported by evidence (not to mention any own experience), so this indignant demand from you is spurious.
   
2. If you ever get to Europe or East Asia, board a high-speed train and look around. That's something many of us have done here (and most of us are middle-middle-class ourselves), and on second class, we didn't find ourselves surrounded by businessmen and executives. I mean, how many executives do you see below? (Top to bottom: inside a German ICE, boarding TGV passengers at two different stations, passengers waiting for a Spanish AVE in Barcelona, inside a Shinkansen)
   
   
   
   
   
   
3. Here is the one HSR service that was actually touted as one meant for business (though that PR changed since with the focus on offering cheap tickets to compete with budget airlines), the Eurostar, still well below half:

"The Eurostars, which connect London with Paris and Brussels under the Channel, are arguably the premier business trains in Europe," said Mr. Morel of Rail Europe. "Last year they carried nearly eight million passengers," he said, and about 40 percent were business travelers.