R36: I completely agree with you that sexual orientation is based on sex/same-sex (not same-gender) attraction and that any man who is capable of attraction to a trans men is, by definition, somewhere on the bisexual spectrum. I believe that people are attracted to, and fall in love with, the totality of a person, and that includes their smell/scent, gait, the timbre of their voice, the proportions of their body, the fact that they were raised as a boy/girl and the common experience they might share as a result, and so on. Very few (if any) trans people are able to fully emulate that, and it's not helpful to anyone to be dishonest about it for the sake of kindness. I think it's harmful--not only to gay men and women but also to the activists pushing this--to pretend that attraction is based on gender identity. Attraction is a complex mix of physical, physiological, sexual, emotional, and sometimes even spiritual elements, and the people who have redefined same-sex attraction as same-gender attraction deliberately oversimplify this process, to the point of being insulting to homosexuals (which they view as a dated, restrictive term).
If you re-read my post, you'll find that what I was questioning is LGB Alliance standing up for young gay boys/men, whom they perceive to feel under pressure to date and have sex with trans boys/men (that is, beyond the context of just this BBC TV show). As I said, most men, younger or older, have zero problem turning down anyone they have no sexual interest in. I don't think they need the likes of Bev Jackson, Kate Harris, and Malcolm Clark to defend them. I am skeptical ('sceptical' for the Brits) of the existence of the lonely young gay boy who is indoctrinated into dating trans boys for fear of being thought transphobic. Can *you*, in all honesty, imagine such a scenario? The elder gays at LGB Alliance can sometimes, understandably, project their own twentieth-century childhoods onto today's youth, who are far more clued up at a far younger age, also due to exposure to youth-oriented TV shows that contain characters representiing all types and sexual orientations, such as (whatever you might think of them) Heartstopper, Sex Education, 13 Reasons Why, Elite, etc.
At the same time, as an elder gay, I am also trying to keep up with the times. I try to be open-minded and understand that there *may* be a new, far younger generation out there of men who are willing to completely accept trans men as part of their community, social life, and so on, in a way that is far more noble and accepting than I might be capable of as someone of an older vintage. I think the elder gays from the LGB Alliance (who are more like me) would do well to maybe actually talk to young gay men and women in their teens and twenties before speaking on their behalf. There's a whole world out there, and they appear quite closed off from it.
For the record: I also don't agree with Peter Tatchell's views on trans, and actually doubt that those are even really his views. He is certainly less than convincing these days.