Grouchy types in the office

Generally when I am in a happy mood, I have on a happy face and where I go people generally smile and greet me first, even people I don't know, be it at a restaurant, or most places outside. I'm not even trying to meet people. They just seem to be friendly towards my energy. However when I am in the office, people clear their throat a lot when they see I have on a happy face.
It is weird. It's like most people in an office building are grumpy types. Without fail, when I am in a good happy mood, there will always be plenty of people clearing their throat in an office building, usually not anyone I work with directly.

When I don't have on a happy face and that happens a bit too. I have no problems with people clearing their throats or otherwise. It's funny.

It's funny because I finish my work faster than most people my pay grade, so I complete plenty of work and things that are often pretty complicated. I don't really like coming into the office, too many grouchy types. They need to lighten up and enjoy life a little bit. Maybe they'll be more creative and productive.

I prefer to work at home or outside when I can.