"If they don't they clearly lack ingroup connections, social awareness, status and are less likely to be the kind of people that are valuable allies. I should shun them."

Yup. Not consciously, of course. I wonder if, generally, speaking, people don't instinctively distinguish between not knowing something and not caring about it. Hence ignorance of facts being conflated with stupidity about a topic, as well as the instinctive avoidance of people who don't already know the social rules of a community.