I would also refer to myself as cis-gendered, if I thought that applied.
What I would voluntarily do I would not mandate for others tho. If I understand what you mean in asking why I used the term heterosexual. Also, I have never had occasion to hear anyone complain about being labeled such. Again, I am sheltered, and have probably just missed it. For my part, I had imagined that it was not unlike hetero-chromia in the eyes. In that it seeks in this case on a sexual level, those not unlike itself. I had been unaware of it's origins.

I find the concept of Human rights as a game to be almost painful. Then again, I can see why putting it in such context would be less painful for others.

I do see your point. That is supposed to also be acknowledgment of it's validity, I don't know if that always comes across correctly.
Mine is different. I see the right to naming deriving primarily from consent. In my culture, there is nothing more explicit in establishing dominance over a person than naming them. Stripping them of their right to define their own identity. What has been done is abomination. It is not made less so by the fact that it targeted a minority for whatever reason. How would you rather be addressed?