So, you could be halfway into it, if you're willing to "give piss on request"... hehe, you're just not into receiving piss in any way. And that's fine, everyone is different. But are you saying you'll give it on video request, or in person, as a piss-top?
Luckily, I haven't been told to stop either. I find it disrespectful; I would be offended. Because there are two possibilities: (i) if you pee involuntarily, it's not under your control even if they tell you to stop; (ii) if you pee voluntarily, it's because you feel like it or because you enjoy it, so your partner shouldn't deprive you of your enjoyment.The best thing you could do is keep quiet, and if you didn't like it, you could politely mention it after sex, NOT during sex.