Thank you for raising an important issue, Interalia. I ran into this kind of discomfort going to a "transgender conversations" drop-in group. Over-all it has been helpful, but I could tell others were uncomfortable with me. I do not have a textbook experience of this. i came believe I needed to explore this persistent itch late in life. Others in the group acted very suspicious. They asked very personal questions such as if I was wearing panties.
I almost left; I almost did not go back.
But I needed to stay, and I told myself that the people who were suspicious were afraid and had been hurt in the past. I tried to be patient and open, even though it was hard. I was so uncertain of myself and this growing conviction that I was not the person I had always presented myself to be. I ended up being glad I stayed - well more glad I went back. Once people started to believe I was not there to hurt or mess with them, they were friendly and helpful.
I appreciate the rules of this site so much. Mostly people have been very respectful of differences. I spent my life defending against others' expected perceptions and expectations. I am trying to believe others' perceptions are neither my business nor my problem. But I have fears also, and being told I am not valid or real or anything like that is too close to the voices inside that criticize me.
I believe fear is only one reason people criticize others who are different, but it is a big one. Why, I do not know, but some people are threatened by anyone who is different. Some "Cis" mundanes feel threatened by any kind of trans and some trans seem to think there is only one way.
I appreciate the diversity of paths, experiences and motives discussed here. Thank you all.