Because In The Worst Case Scenario That Could Result In That Person Getting Hurt - Tumblr Posts
THIS!! I'm in a trans group irl, and one of the biggest rules is not outing people. Understandably so: outing people can be EXCEEDINGLY dangerous! That should be a no-brainer, especially for other queer people.
Periodic reminder that unless a person specifically and clearly tells you it is okay to tell others they are trans or queer, you should err on the side of caution and assume they do not want you to tell people (especially random people!) about their transness or queerness.
You have no idea, generally, why somebody doesn't talk openly about their trans or queer status, and you have no idea, truly, how somebody might react to that information. The most progressive person out there is still capable of harbouring incredibly negative thoughts about somebody's queer status.