Nobody can be refused anything if not Vaxed. That is the law of Discrimination. Regardless of any reasons you have to refuse the unvaxed, you are discriminating because they have different DNA. Djokovic can sue Australia Government for blatant discrimination as if he was a refused for being a Black person with different DNA. It is a defamation, loss of income, loss of ranking, loss of trophies, loss of future income suit. A Billion Dollar winning case. Same against the US Government.