Hi, gay man here.
I don't give a single shit if someone is 13. That's not just 'edgy shit' and I will judge a teenager for calling people faggots continuously online, as should we all. You excuse it at 13, you excuse it at 14, you excuse it at 15, and on and on. And when you finally deem them old enough to be called out on it, they will try to say it's 'just a word' and to stop being sensitive, and it doesn't mean anything bad, etc.
Now I'm not saying she deserves to be ATTACKED over it, but if people want to be rightfully angry she was saying that kind of stuff and want her to answer for it, I'm fine with that. She's allowed her anger, other people are allowed theirs.