I'm tempted to create a drinking game for every time the Enlightenment gets blamed for whatever somebody thinks is wrong with the world.

So how should I answer questions about my sexual history in a medical context?

"No."

Or if there are looking to be a lot of questions, you can head them off with "no, I'm a virgin".

Men without families have always been considered expendable. The whole concept of army is built around that. I'm not saying it's right; I'm just saying it's old as history.

The new thing is that "having sex" has been completely divorced from "having a family", so now some stigma (less) is associated with not having a family, and some stigma (more) is associated with not having sex. It makes sense this way, because being unable to attract someone implies being unable to start a family. Again, I'm describing here, not making a moral judgement; I don't have a problem with people not reproducing.

It sucks to have low status. But it is stupid to needlessly tell strangers "hey, I have low status".

I don't believe that I have seen any statement that incels are freaks stronger than your own statement that "otherwise she might assume that I had gone to prison for 30 years". I'm sure that there are some people who might assume that -- or worse -- but I would not expect that most people would.

Likewise, when someone overshares about their problems (and if you defined yourself as an 'involuntary celebrate', you are framing it as a problem), the default social response is "don't give up, you can handle it!" whether you're talking about dandruff or cancer. Her response may not be what you hoped for, but it wasn't a clear indicator of prejudice.

Otherwise she might assume that I had gone to prison for 30 years or something ridiculous like that

the male nurse might assume I'm gay otherwise

What you need from the nurse is her set of skills. Her personal opinion of you is irrelevant to doing her job. I understand that we may see health professionals as higher-status than us, but they're actually doing us a service. You don't need to feel intimidated by an unspoken imagined condemnation.