cis is the opposite of trans, and refers to people whose gender identity and biological sex are the same.
I think there's a lot of tying up in knots going on here (and I say this as a recognised expert on that front). Denying transgender people their rights in an equal society is clearly wrong. That has literally nothing to do with the question of whether or not I personally, or anybody else, would wish to pursue an individual romantic relationship with one.
Romantic attraction is fickle, and for some people it's also embedded in choices or hopes about their future life. If people decide that they only wish to date somebody with whom they can raise their own family, there is literally nothing wrong with that decision. Nothing at all. To alienate people who make that choice is judgemental, divisive, and clearly wrong.
Please, Tim, reflect more carefully on this. You are cutting yourself off from your friends and the only people who lose out on this are your friends, present and future, and most of all you.