I can see how you would come away with that impression under the circumstances. I've been in that situation a few times myself over the years.
If you walk in cold off the street to an established group session, don't expect too much, that's their "play time" and they take it seriously. My best advice in that situation is three things: show interest in what they are doing, be patient, and be persistent.
When you think you are ready to try and break the ice, stay away from the yard operators and dispatchers. Too busy! Pick someone doing a local freight and follow them, he will have lulls in activities, and will probably have some time to chat, and after a while may even let you help.
Private layouts are a little different. Typically, those are by invitation only. You are either invited by the host, or with an established crew member. In either case, you have an established connection and will have a more "friendly" experience.
