"Jirai kei" translates to "landmine type".
There isn't a stereotype being attributed to a fashion style, it's the opposite, the aesthetic became a connotation to a term used to refer to emotionally unstable girls due a noticed overlap of that mentality and girls who engaged in trendy internet...
I gotta say, I mostly disagree with everyone else's assessment on who's getting their rightfull comeuppance for sucking on earlier chapters. I don't think anyone in these chapters deserves to get screwed over except Rinko/Riko/The bob hair girl, and another character I'll name later on in this...