Do I feel that people with body dis-morphia should be supported and treated well? - Yes
What do you mean 'supported and treated well'? Who decides what support and treatment is beneficial for them? What is the differential diagnosis for 'body dis-morphia'?
Do I feel that all people who identify as trans are sexual predators? - no
Is a male that enters female spaces not already showing signs of boundary violation and thus, has some of the sexual predatory characteristics that have been known about for decades?
Do I feel threatened if there is a penis in the cubicle next to me when I have a wee? - no
This penis is usually connected to a man, who already has a perfectly useable toilet usually across the corridor. He is taking the space from a woman which, especially at busy times, means women can be in the queue leaking into their underwear, or in great pain. A man is more likely to install a hidden camera so I'm guessing you are ok with any images shot appearing on porn sites across the world? There have been hundreds of threads about what one man does to a female space, this is just scraping the surface.
Do I agree with people who have been through male pubity competing in female catagories in sport? - no
You mean puberty, and are you saying that you think boys should have their puberty blocked in order to qualify for racing against women? This is a very confused and quite activisty sentence you have used here. What is it you are actually trying to say here?
Do I feel that someone I know - who has now been living as a woman longer than she ever lived as a man, should be able to use female pronouns and spaces? - Yes
You can call your friend what you want. But your friend needs to know that he cannot ever be a woman, and if women read him as male they have every right to act accordingly. You do not have the right to give up every other woman's rights to single sex spaces.