The post is not about gender dynamics at all (though it's easy to imagine that those underlie the post, and such a guess probably has a decent chance of being correct).
I will agree that the OP made an error in framing the question as being about informing the coworker that the OP does not want to be alone with him. By this I mean that the identity and characteristics of the coworker seem totally irrelevant to the question as asked. I tried to address this in my answer, though that obviously doesn't have any impact on the nature or appropriateness of the question.
I've submitted a suggested edit which removes all gender information from the question, as they seem irrelevant.
As originally written, the question strikes me as being more similar to something like:
I'm seriously allergic to the venom of [some spider native to the OP's area], but I see those spiders in the server room all the time. I'm uncomfortable being in there because, if I were bitten and needed help, the noise of the machines and soundproofing of the room would make it hard for me to alert anyone.
It's not a perfect analogy (especially as the presence of a second person in the spider example would necessarily address the spider bite problem), but it highlights the real intent of the question: the OP feels unsafe in that particular environment, not necessarily because a problem is more likely there but because if a problem occurred it would be particularly difficult to address.
I think that an honest reading of the question as originally written clearly indicates that the problem is the effective isolation of people in the server room from everyone else, even if that particular concern is heightened due to gendered concerns (reasonable or otherwise). In other words, there seems to be a real concern which could exist independent of any gender bias, and that concern is worthy of a question here (even if the concern may be overblown in some particular case).
To dismiss that concern in favor of a different one which is orthogonal to the question as currently written strikes me as unreasonable, even if the OP included something really blatant like "P.S., I am afraid of all men because I assume they'll assault me". That would be an issue, but not one that touches on the specific concerns outlined in the question.
Even if we were to assume the worst possible interpretation of the OP's post (that they are specifically afraid of assault due to the presence of any man in the server room with them), I'm not sure that that makes the question out-of-bounds. The OP may or may not be disproportionately fearful here, relative to the actual risk they are encountering, and it's a fair answer to suggest that their fears might be overblown and accommodating them in this instance would be unreasonable.
I suppose that it's possible that the OP does have a misandristic streak, and that that is 100% responsible for their preferences in this situation. It is further possible that the OP is aware of this and has intentionally written the post in such a way as to obscure that, and is looking for advice to plausibly pursue their bigoted agenda under some other guise and avoid the Workplace.SE rules.
But it's every bit as possible that the OP has been assaulted in an area where they could not expect calls for help to be answered, was traumatized by that event, and is currently undergoing therapy to help but hasn't overcome the trauma yet.
It's also every bit as possible that the OP is aware of the well-established statistical evidence that men are more likely to commit assault than women, that being alone in a room where help is not available makes assaults safer to commit and more likely to be successful without consequences, and that a random man's seeming likelihood to commit assault against a person (in that person's judgement) is far from a guarantee that that perception is accurate (even in the case of a man known to that person for a long time).
Even if the OP's absolute risk of being assaulted increases by only 0.0001% in the circumstances described, that level of risk may be more than they are willing or able to tolerate. Again, answers suggesting that that threshold is inappropriate seem like valid answers to me, if uncharitable ones, but it's not clear to me that the OP is tarring all men with the same brush due to concern about a situation where risks are heightened.
You seem upset about the treatment of one of Kilisi's recent posts. I've not read it, so I can't comment directly on it. But, if its deletion strikes you as unjust, it seems like a puzzling reaction to demand that that injustice be repeated elsewhere.