What a complex thread, and no surprise there. I'll add a few thoughts.
I don't think it's necessarily shallow, but the practice of routinely declining to have sex with poz folks might mean that...
- You're missing out on great sex with great people because you're not willing to make some compromises
- You're putting yourself at risk by believing your partners who say they're negative and so you're not regularly taking precautions
The last point is really important. If you are not having safe sex with your casual hookups because they tell you they're negative, you're being naive. Too many men, all across the sexuality spectrum, will say whatever they need to to get laid. My hope is that unless you're in a monogamous relationship in which you've both been tested, you protect yourself as though your partner is positive.