Because most of the crew find it weird that the bridge officers of nearly every ship and station are casual Earth supremacists who are only interested in human games, music, and culture. Among most bridge crews, even obscure 20th century human culture is more popular than contemporary Vulcan or Andorian culture. Starfleet talks a big game about diversity and inclusion. But in their hearts, the officers are all a bunch of human supremacists. You pretty much have to be to rise through the ranks. For most of the crew though, ancient human games like baseball are shunned as symbols of casual racism.
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