This sent me scurrying for the dictionary. Actually, it made me do a Google search of the word troglodyte.
Here is what I found:
For one, it means someone who lives in a cave, especially if they are a member of a cave-dwelling community.
It also means a loner–someone living by themself or who is antisocial.
Additionally, the label of troglodyte can be applied to someone who has reclusive habits, is outmoded or has reactionary attitudes