And then there's Adira having to "come out" as non-binary. Again, dated, and makes no sense for the all-accepting utopia of future-Earth.
This was address in an interview with Blu De Barrio I believe. The writers and Blu were aware that by the 23rd/32nd centuries 'coming out' in the traditional sense would probably no longer be required. But it was consciously done in the way it was to acknowledge and honour that it is still difficult for people to come out in the 21st century. Later one we see that the crew refer to Adira as 'they' without a second thought, so obviously it was no big deal.