The US is extremely car focused, which they often don't really realize. Things that are normal here (like everybody has a bike) conflicts with their cyclers vs drivers culture. Such a distinction simply does not exist here. Instead we have roads that are red with signs "Cars are guests". Or indeed city centers where cars aren't allowed.

When I go to the US I'm often surprised that you can't get to things that are only a km away by foot because a road is blocking you, no way to cross it.