I do not know of any particularly bike friendly cities, and the town where I am from in Florida is not what I would call bike friendly. The bike paths that were here for years were pot-holed and terrible. Half a mile would have about fifty major slams to your wheels. There are bike lanes, but that is because new roads had government funding, and government mandated lanes for cycling, and even those are right out in traffic. My town is right on the Atlantic coast bicycle route. It is not recommended that anyone cycle south of here to West Palm Beach on Highway US One. A much better route is A1A starting on Jupiter Island and going south.
No, I cannot call this place bike friendly, but some drivers do watch out for people on bikes, and some are quite courteous in ways that you would never ever see in other parts of the world, such as in China for example.