Looks like a plastic, silicone-'enhanced' bitch to me.
But aside from the effect of bleach on fabrics, thats asking to injure someone. If someone is on public transport, they could be a long, long way from home, or from somewhere to clean it off, and suffer chemical burns as a result of being covered in bleach (household bleach being a mixture of sodium hypochlorite, NaOCl, an oxidizing agent capable of causing burns itself, as well as caustic soda, which, needless to mention, is, well, caustic. I've become more or less immune to NaOH, as long as it isn't fused, molten caustic, which to get to that state, needs to be at well over 200 'C, at which point it becomes an entirely different beast, much, MUCH more corrosive and dangerous, given I work with loads of the stuff. And I don't get any irritation, much less burned by even concentrated solutions of it, even when hot, as long as I wash it off promptly. It will burn if in the solid state, and I don't realize it's there, and stays there for hours, it typically comes in little prills, some are more easily seen, at least before their hygroscopic nature causes them to absorb so much water they liquefy, at a size of maybe 1.5-1.75mm give or take, but many brands come as tiny, tiny little grains, about the same size as a grain of salt, and if one of those drops somewhere, and I end up lying down with it pressed against my skin and it stays there for hours, then yeah, I'll get a fair bit of stinging right at the area of contact, and of course if any were to get in my eyes, then I'd ,be in a bad way as would anybody else. But it seems like my hands, arms especially, over the years of my being a chemistry hobbyist, I've just used so much and gotten it on me that my body has just gone to itself 'well fuck it, whats the point in reacting NOW of all times? its happened before and it'll happen again', and I've become partially immune to it's ill effects.
But shit, throwing bleach on people....that's hardly controlled, to begin with. What is to stop the person next to them, who could be a child, from getting it on them? or someone having a splash hit them in the eyes, leaving them continually being burnt in their eyes until the train stops and they can scream for help, if nobody has water with them on the train itself? that could easily blind someone for life.
And as for 'manspreading', so.....she is obviously a sexist piece of shit herself. Because she's by the very name given to it, targeting men. Is she doing the same to women? something tells me she isn't. And I bet she'd probably freak and start firing sand out of her vagina if a male went around throwing bleach on women for resting with their legs apart.
No, perhaps it isn't the nicest thing to do, as a habit, but generally, people could be persuaded to give you the room you are entitled to as basic personal space just by being told 'fucking move it', and throwing corrosives on someone bar the exception of rapists, child sex offenders, or if one happens, for completely unrelated reasons, such as having made a purchase and being on the journey home, of something corrosive and then being attacked by street thugs intent on kicking the shit out of you for 'sport' or doing worse besides, or at an armed burglar, especially if warned first to fuck the hell off, or you will do exactly that, you just don't do that kind of thing.
But just because some fucking bitch is a sexist obnoxious, stuck up, entitled little snowflake with a chip on her shoulder, gets annoyed by the way someone sits? I don't think it's a minority who'd react with violence if someone walked up and threw corrosive chemicals over them. I should think MOST people would kick the fuck out of whoever was responsible.