To make this discussion shorter, let's ignore the part that also women can be violent, only let's only focus on what "normal male" means in this context.

I also have objections due to the ambiguity of that word (and its antonym) in a different dimension: is that supposed to mean ‘typical’ or ‘functional’? I think that most people would agree that it's common for men to be abusive, but wouldn't agree that it's desirable for men to be abusive. (In this particular post, it clearly means the former, but it's so common for that word to be used to sneak in connotations in order to induce the reader to commit the naturalistic fallacy that I'd rather less ambiguous words were used instead even in these cases.)