Didn't the MC do SO much to deserve that promotion in this episode? I mean, he did all of ... uh, absolutely nothing other than almost kill them all, but he's male (and thus superior to the poor female who actually saved the day) and the protagonist, so we'll ignore all that! Isn't it so funny how she hates men for being sexist, except for the MC who she likes even though he's useless while she isn't? And on that note, I could probably make a pretty good case that her violent attitude is only considered to be a 'problem' by the characters in the show because of her gender. I don't know if there's another good explanation for it.
It's such a grossly sexist show, unpleasant stuff. But of course, the show is absolutely loaded with visual fanservice too (having main girl say something about men there one second, long pandering shot of her the next), so it's not like it's surprising. Just unfortunate. Rail Wars is a badly written, badly drawn, and stupid show. So why haven't I dropped it yet (I'm up to ep 5 I think)? It's completely stupid and awful, but it's kind of amusingly terrible I guess?