am an engineer, these people act exactly like engineers/scientists i work with daily, albeit these being more relaxed because they're in a restaurant setting. i believe the issue is most non-scientists have been conditioned to believe scientists are verbose, all-knowing beings with nothing but lab coats in their wardrobe. in reality we're just normal people highly specialized in a single field through a lot of studying, achievable goal by a good amount of people.

what in your mind does a scientist sound like? may not be realistic.