Aurelian
my friends call me "Cunty"
No, Cunty. No one validated your point as your point is the only thing misguided here. A person can bring down a room and when you see a friend, colleague, or simply a person on the street in a poor mood - be them man, women, or child - it is generally understood by sociologists, psychologists, and anthropologists that those attitudes can have a direct effect to those around them. Asking them to feign happiness would lead to a cascade effect of improved moods and attitudes. There is a reason why cashiers, waiters, teachers, and others feign happiness in their jobs instead of looking at you with a scowl.
Hey, I don't know if you noticed, but those are paid workers. They smile because it's a practical tool for their job, or even out of fear of getting fired.
Someone on the bus or on the street? They're not under any obligation to make you happy. If you insist that they "smile?" You're just being a selfish asshole, because it's about making you happier, not them. How about we either let people be, or if we're really concerned, ask if there's anything we can do to help?