I will wade in a little. As Grace said being a supporter of our issues goes beyond waving a rainbow flag, it is educating people and letting them know what being trans* means.
I had two issues at work when I came out. One lab, staffed by women, where having a hard time with me. So I went to that lab and just chatted about anything and everything, within a few days I was getting phone calls from them to join them for a coffee. They no longer have any issues.
In another lab (one in which I actually ran rather than just in the hospital I work in) I heard that I was receiving jokes and comments behind my back by male members of the lab. I went there and had a private talk with all of them. I told them what it was like to grow up in Liverpool as a transgender child, about being raped, about being molested at the all boy school I was forced to go too. I told them the fears I had of coming out, how I thought I would lose my friends, family, job - I told them that in the end it was a choice for me between suicide or transitioning.
I got hugged by each and everyone of them. I heard later that if anyone makes a '->-bleeped-<-' joke in their presence they are really put in their place.
We can educate people. We can stand up for our rights and the rights of our community, our trans*children, the elderly who have hidden for their entire lives.
That Caitlyn had the strength to stand up and make that speech was a remarkable act. Yes she is wealthy, has power and powerful friends. But she also has her fears, her pain, her sorrow. Just like the rest of us.