It wasn’t the trip itself thats particularly viewed as problematic, it was the atrociously patronizing marketing surrounding it and that Katy Perry is just a generally vile person. Nobody is begrudging Amanda Nguyen or Aisha Bowe being along on this trip, they’ve dedicated their lives to the celebration of science and supporting the work of legitimate astronauts (and I suppose arguably so has Shatner, though he’s not exactly a man of flawless character)