yeah, the USA sucks.
But:
* don't tell everybody that your friend is trans if they're not ready yet
* ask pronouns immediately, and be willing to use new names and pronouns if they want to.
* showing that you really support them and helping them through dysphoria can mean a lot more than you can imagine
* report bullying, BUT never give the person you're reporting to your name, or your friend's name in order to prevent them saying their name or yours and making everything really bad
* overall, just try to be nice about the whole thing and help them if they need help :)))