GC is there to support a community which has been deemed less 'acceptable' by society to play video games. That's why there's a smaller community, it's not just because females are biologically worse or anything, stop saying that. This system therefore exists as a positive force to encourage and most importantly develop this community, maybe so that one day women are incorporated into the actual VCT.
As for trans people, they've gone through this same 'shunning' but for some who have been viewed as males for most of their lives they may have not - so I can understand why people are angry but at the same time it's unreasonable to dig into their past to find out, so it's better just to give them the benefit of the doubt. And honestly just imagine the kind of toxicity and transphobia they'd often experience in ranked anyway, regardless of when they transitioned. Also it's not like every trans player is topping the charts and destroying everyone else in the scene, so people really shouldn't be that mad over it.
Just my thoughts.