I’m just going to quote something from Orylia on what to do when someone is being transphobic:
And also, ignore. If you don’t do either, and engage, depending on how you engage, it can all fall back on you too. If someone is being transphobic, or is trolling just in general, report, and ignore. If it is a thread, mute the thread too.
Sorry Orylia for quoting this several times around the forums.
Blizzard can not do anything if it is not on any of the Blizzard owned platforms, such as if it is happening on Twitter or Discord.