Lets try a variation on this question: if you were in love, and your lover who had previously tested negative - say just weeks or days before you first started dating - tested positive three months later would you stop having sex with him or stop loving him or leave him?
Look, the OPs question is loaded because it's always about rejection and acceptance. No matter how well-informed and aware, you cannot compare knowing to not knowing. And some men are still deeply afraid of sero-conversion.
I was, for decades. I lost close to 200 friends and colleagues, and I'm still negative as of my last test. Will I sero-convert? Doubt it but at 53 I no longer panic. Time - and the ability to see the end since I'm (likely) well past my halfway point - give me a different perspective. I can't expect someone who still has no real grasp on death's eminent arrival to understand how to gauge the value of hastening it even by a risk factor of 1%.
Do I think they're being paranoid? Yes. Do I think they're stupid or ignorant? No. They're young. Not immature, just young. They have no perspective and no real way to measure the value implied every time this question is posed.
Sex is joulyful - well it should be at least - and love is amazing and deserved by all. But nobody can teach you the value of risking life for love if you have never lost it, survived the loss of it, or missed the opportunity and realized it too late.
Loaded question for anyone under 35. To say yes you would have sex is enlightened and forward thinking. To say no is simply to be honest about your priorities and your fears. No amount of chastising is going to teach what only time can teach. You can't call people's character into question when it hasn't been tested by time.
They'll learn eventually. Hopefully NOT in the manner I suggest at the start of this, but for some it will happen exactly that way.
The only genuine character flaw I could see is someone not willing to out and out say 'I won't date you because you're poz'. Because if you can't tell a guy no for the real reason, then you're a coward. If you feel justified and comfortable with your logic then you have to own it and not couch it.