I agree with the sentiment, Sideshow, but you can't really speak on behalf of every single person whose life has been negatively affected by suicide, nor people who themselves have/are currently considering suicide. That being said, I'm not at all trying to jump to the defense of every helpless, wounded soul and staunchly protect their feelings by banning the phrase "kill yourself" as a casual insult, I'm just pointing out that it's generally extremely tactless to do so. Also the examples you gave aren't used as insults so it's pretty different. Obviously someone just being like "Ugh this paper makes me want to die" is just them exaggerating how little they want to do the paper, but that's very different than actually telling somebody over the internet to commit suicide. Maybe they actually have suicidal thoughts and you push them over the edge. Is that very likely? No, not really. But why take the risk? You have no idea what's going on in that person's life and an offhanded remark like that, whether you mean it sincerely or not, isn't really ever called for. There's no real reason to opt to say something so extreme as opposed to a healthy and amiable "fuck off".
My condolences for your losses, and I respect your perspective. I just think we're coming at this from two different angles. I didn't say suicide should be taken so seriously that you literally cannot make an offhanded remark about it ever, I just said it should be taken seriously enough that using it as a casual throwaway insult equivalent to "fuck off" is a habit that people should try shaking off. I'm not saying that because I think every person who's lost a loved one to suicide needs to have their feelings shielded; many, like you, aren't bothered by remarks like that because you know they aren't serious. But again, you don't speak for everyone, and there are people who can be harmed emotionally from an off handed remark like "kill yourself". It may not carry weight for me, or for you, but it could very well carry weight with the complete stranger you're interacting with and that's not a risk worth taking under any circumstance in my opinion.
So yeah. Sorry if it seems like I'm soapboxing and trying to speak for everybody who's been negatively impacted by suicide, or seems like I think suicide should be taken very seriously at all times and should never even be joked about. That wasn't my intention at all, and I hope my point is a little clearer now. I do completely agree that creating a universal no-tolerance taboo is pretty much always a bad thing, as context is always key, but given the context of insulting a stranger over the internet, I consider suicide to be stuff that really shouldn't be tampered with. Same goes for "faggot" or "nigger". It's just really loaded stuff that could potentially carry a lot more weight than is called for when you're just upset at some nerd over a video game.