I never encountered a trans person that wasn’t honest about it
I guess you're not on dating apps?
Happened to me a lot. For some reason, especially while I was on my way to meet them. "Hey, by the way, is it okay if I have a penis?*
Look, I'm sorry, I'm not attracted to penises. So far I've only had one attempt to say it's transphobic to not want to have sex with them, but even for the others it's really shitty to lead someone on like that.