I practice where I please.
The U.S. in general has larger houses and more open space, both enclosed and outdoors. Here in the U.K. there is a greater population density - rooms are smaller. Comparatively speaking, space is at a premium.
I share a house with three other people all of whom have varying degrees of autism - we are all Aspergers Syndrome types - and all of whom are extremely sensitive to noise. I am permitted to play classical guitar in the house, but not whistle.
Once I practised at the end of the garden. The neighbours made a point of remarking how much they enjoyed it, and my family objected bitterly.
Now I take my bag of whistles to work, and lunchtime is my practice session. I go out to the park, five minutes walk away. Sometimes I get rained off, but not that often. The dog-walkers know me, and sometimes in summer the children come and ask questions and wangle a go on the whistles. Because the climate is mild, it's rarely too cold to play. Oddly enough, it's in March and April that my fingers go numb. In January and February I'm bundled up warm and my extremities don't lose so much heat.
The post-office is nearby, and the postmen have told me that they can hear the tunes a mile away. The people who live around the park sometimes thank me for playing, saying that it cheers them up in the middle of the day. Nobody so far has indicated that they object. I've even been invited to perform elsewhere.
I'm glad I don't live somewhere with a greater population density, like Japan or the Phillipines. I don't know how people manage there.