semi-social
Semi-Social is someone who socializes in any setting with those only that have common knowledge to that person and remains anti-social to uncommon people that they have no attraction to. Someone who is semi-social is wise with their pick of friends because they examine the person to see if they are friend or foe.
The semi-social man went in public, ignored the annoying simpletons, and engaged in a conversation with a couple of eccentric free thinkers.