I don't think the male vs. female distinction is the determinative one here.
It's the absence of the usual victim blaming rhetoric. People are processing an event that hasn't been given a dominant narrative. In the existing narrative, it's not that Depp was an imperfect victim, but rather that there's a stark juxtaposition between growing evidence that he was physically and emotionally abused and the very real possibility that Amber Heard was physically assaulted, as well. You can argue mutual abuse is a myth, that there is an element of reactionary abuse there, that people should do more research, but the usual victim blaming and just processing the specter of two people who ended up deeply hurting each other come from notably different places.
Read this NYT article:
Johnny Depp, Accused of Spousal Abuse, Says Ex-Wife Was the Aggressor
Illustrative snippet:
A lot of people are going to read stuff like that and feel that the easiest place to land is "both parties were toxic and abusive." Some of you are calling that sentiment victim blaming. That's understandable, perhaps it is, but this strikes me as a case that calls for some serious soul searching as to
why that's the case, as opposed to using it as a cudgel to get people banned or using it as a launching pad to complain about moderation and double standards.