Oh, come on. We're talking about video games, and sometimes spiders are gonna be in video games. They knowingly take that risk going into a gaming forum. Sure, if you know that somebody hates spiders, it's nice of you to not put spiders in their face. But it's all on the spider hater to avoid them. Plus I'm pretty sure there are extensions out there that can filter out "triggers" for people if it's really a problem.
Like if I was allergic to peanuts, should I expect everybody to go out of their way to not have peanuts around me? No, that's ridiculous. People can do as they damn well please, as long as they aren't intentionally trying to fuck with me. It's my job to avoid something that's gonna cause a problem.