His worldview is not complicated. His ideas are not complex. He thinks working in McDonald's is sufficient to provide for all his future needs and wants. That troubled me.
Show that you can add value to the organisation, and show that you have the right values to carry out the role.
If you are looking for a change in career trajectory, say so. If you are searching for better prospects, say it too. If you do not know much about the position, be open about it.
Do not confuse an interview with a casual chat session. Take the interview seriously.
How many hurts and grievances from your own past can you recall? How many do you hold onto and still recall in vivid terms?