@Kivan Zia - We haven't "done this" at all. it's only just now that we're beginning to cross the threshold with trans that we crossed with blacks in the 80s or women in the 60s and 70s - that it isn't cool to make fun of them. Now is the moment where we're just beginning to have the social awareness and sensitivity necessary to "do this".
Attempting to live, even in this time, as transgender is a nightmare. We are orders of magnitude more likely to be victims of violent crime or police brutality. We face persistent and pervasive discrimintation in housing, employment, and basic social services you take for granted (such as going to the bathroom in public). Our murder and suicide rates are nothing less than genocidal in scope.
What's the statute of limitations on dehumanizing people for not fitting into a preferred social class? When do we "do this"?