Welcome to club politics, eh? Actually, I think what you're running into is a group where familiarity has bread informality. Those guys have probably been together for a long time, and likely know each other's equipment and flying habits well. If you've been quietly going along, they won't have any idea that you're uncomfortable.

I would suggest talking to them while you're at the field first. How do these guys behave when it's more than just you and them?