The only federal democrat running for POTUS to throw a bone to trans people was Hillary Clinton. Biden did nothing while he was in power, but many of the reforms Clinton did did in fact help trans people. As SoS, she verified that trans people could change gender on their passports and use them to get jobs. This was huge because it bypassed many terrible state guidelines that made it impossible for trans people to get a job without outing themselves. It has likely saved some people's lives.

Compare this to Biden's track record. He supported DOMA. He increased police presence, which naturally impacts trans people poorly. I've had a cop reach for his gun on me once, he was surprised when he checked my ID and realized I was trans / lying about my identity. I was just eating food in a fucking park minding my own business.

I voted for Hillary because she did something tangible for the trans community. Biden is a nod to the right-wing Southern Democrat part of the party, whereas Hillary at least tried to make a show on domestic policy. Both obviously suck ass on foreign politics, and that combined with domestic policy is why I'm voting Green.