It's okay to have dating preferences, but it can be really isolating when you're in that preferential minority. I think we have to be careful with expressing that in spaces that include cis folks, because it can absolutely fester into transphobia, but it's basically understandable to be discouraged about stuff like this. Overall, I wish there was more leeway and empathy toward trans people who express they're lonely without defensive cis people interpreting that as "trans people insist that you must be attracted to them or you're a transphobe" (which most of us aren't saying), but we're definitely not there yet. And while acknowledging that, maybe we do need to have thicker skin when some trans allies aren't attracted to us. Beauty's in the eye of the beholder, and there's someone for everyone.
Another example I think is more apt is a Pew Research study I saw a while back that said majorities of liberals acknowledged trans people were a marginalized group, and majorities also acknowledged that we should have more rights, yet most of the same people in that category believed that gender is determined by sex at birth. And I guess it's up for debate on the degree to which those people are genuinely allies. (Edit: Source!)
I think a lot of this stuff is generational and once social acceptance increases to the point where more people transition younger on average, and also once young cis people are brought up in that era of social acceptance and positive exposure, we'll see more genuine acceptance that trans people are their gender identity, but only future generations may benefit. But just because most these days don't see trans people as their identified gender, there are definitely the wonderful ones who do, and maybe we should be screening for those people instead of fixating on the ones who aren't interested.