Some advice:
Don’t tell girls “I can’t believe you get hate” or “I can’t believe anyone would treat you that way” to express shock when a girl is harassed or treated badly. Don’t use language that expresses disbelief.
Instead say, “I’m outraged” or “I’m so angry this happened to you.”
I know our tendency when trying to be sympathetic is to express shock, but right now, in this world, it’s a reality for millions of girls that being raped, abused, beaten, assaulted, and harassed will never end in justice—because no one believes them. In our society, girls are not to be believed, even by other girls. This is what we’re taught, and the ways in which we communicate this is often more subtle and insidious than we realize. It doesn’t matter if you’re a feminist because it’s institutionalized in our society, and it can be a microaggression or a well-meaning gesture. But it happens. Girls are not believed.
Say you’re angry so she knows you believe her.