For some people, going to a restaurant is part of the enjoyment of eating. They like the ambience, conversation, music, presentation and experience of sitting at a table. Others would happily skip all of that. They would rather order their favourite meal, bring it home and eat it on the couch, at their desk or in the comfort of their own space. While this can look like a simple food preference, psychology suggests that convenience, autonomy, time perception, cognitive load and social preferences can all influence the decision.
It does not mean that someone who prefers takeout is antisocial or introverted. The reason may be much more practical, or psychological.