OSS authors are not held to a standard defined by all of you - they are welcome to express themselves however they want. For instance, my mother would find Brainfuck quite offensive. That doesn't mean the author should change the name.
I think the play on words is quite clever. I also think that if anyone is being marginalized, it is the "bro" - identifying the stereotype and calling out common the stereotypical language habits ("bro ...no").
And now for my personal opinion... If you're worried about the cultural implications of the names of software (rather than things that ACTUALLY marginalize women, like lower average salaries, micro-aggression and objectification, and massive imbalance of gender in the hiring process), then I think you're probably never going to be happy with anything unless it's vanilla. The fine line between comedy and tragedy in the artistic side of programming is often misunderstood, so for now I'm going to go gem install bro.
As a second note, why don't we say things like Homebrew marginalizes the alcoholics or those addicted to coffee? Because that's silly, right? Right. Fight more important fights with the same vigor.