From personal experience Japan is fairly conservative in terms of ideology when compared to the world. If you are looking for an overall accepting place, I would seriously stay away. Your experience there will probably be the same as the other countries you lived in, if not worse

Japanese are extremely racist to foreigners so I don’t think your luck there would be much better tbh

Pretty sure this isn’t specific to the United States. The whole worlds diet basically has dairy in some form or another, no?