If someone in the US hasn't been in a position to take commuter rail with any frequency in a relatively small number of places--or maybe take Amtrak on the Northeast Corridor sometimes--it wouldn't surprise me in the slightest that someone would never have been on anything beyond light rail (if that).
Probably referring to me? I live 2 hours from the closest airport. There are no trains near me. Barely any buses. And I am not counting trains within a city just taking a train to travel between cities.
I do not live that far from an Amtrak station but there is only one train a day, it takes forever, and does not go anywhere that I am typically traveling.