Wait, so because other people aren't accommodated, we also shouldn't accommodate gender non-conforming people?

Having a separate first-last name is often brought up as a UX failure for exactly this reason, and UX designers often design websites so that colourblindness doesn't hamper usability (in my experience working with designers at big companies). The Christmas one isn't as much of an issue because AFAIK very few people are meaningfully put out by seeing Christmas decorations on websites from majority-Christian countries. In other countries these things often /are/ turned off depending on cultural sensitivities.

We should be trying to design our processes to fit the world around us, not rejecting the parts of the world we don't like.