That honestly doesn't seem that bad. It might not be a smart thing to do in the grand scheme of things, but I can see it being an action that a naive member of the crew would do. I think if that truly was the wrong thing to do, then the GM should have stepped in and said something like "Are you sure about that? This region of space is notorious for having lots of pirates around". Being shunned from a group for something like that feels a bit unreasonable, IMO.