Not a lot of what you seem to have gleaned from this thread is actually true.
People choose to live in HOAs. The rest of us are happily living in areas where we do our own thing.
The assumption that tumble dryers have a decisive impact on the environment is a curious one. The dryer I use takes about 35-40 minutes to get a huge load dry - towels, bedding, jeans, sweatshirts, etc, all bunged in at once, and set to 'low'.
"The US" does not get a uniform number of sunny days across the board. The Pacific Northwest, for example, is notoriously damp and chilly. Additionally, some parts of the US are too cold to make outdoor drying of clothes practical in winter. Many people dry clothes on a basement rack.
As well as having several different climates, the US has several different cultures and hugely different environments, beginning with the basic urban-suburban-rural divide. Bigger metropolitan areas tend to have public transport and thousands of people who do not drive because they don't need to in their daily lives. The idea that people get looked askance at all over the US for walking or taking public transport is just plain silly.
You would be thought incredibly foolish if you were to walk somewhere in the current heatwave in the south west, or through the hills of Appalachia where you might be sharing the road with bears. Many parts of the US have snakes and/or alligators living in close proximity to people. Many have incredibly dangerous urban neighbourhoods.
Even aside from extraordinary heatwaves or wildlife or urban gangs, the humidity experienced in huge swathes of the US in summer is something Britons generally don't appreciate. Nobody likes to venture out and have their clothes soaked with sweat and stuck to them in minutes, and in winter the cold can be brutal across all but the southernmost states.
If you have the choice of a car, it's a practical alternative to weather-related unpleasantness. All the same, people do walk places, go out jogging, biking, walk their dogs, do yoga in parks, kids play in playgrounds and on tennis courts and pitches, etc.