Do you actually have an example of anyone who just casually switches their identity "throughout a day"? I'm not gonna argue stupid hypotheticals with someone who wants to be a martyr, talk to me when you have actual evidence of that being a huge problem in today's society.

And none of this changes the fact that it was a stupid and unnecessary message, because it was stated in their bio that they are non-binary and they certainly don't view it as a choice. OP hadn't even met them, and then offered their backhanded apology that nobody asked for. If it was literally any other characteristic about the person they matched with, it would still be stupid and unnecessary.