Transhumanism - I agree with you this is a dangerous path, but I don't think it's one we can stop anyone from going down. I think we're going to have to learn this lesson the hard way.
Prejudice - I'm not sure you understood what he was saying (or perhaps I don't). He's saying everyone is free to do what they will as long as they aren't harming anyone. What "harm" means here is unclear, but it seems like a good sentiment to me.
You got that right with about prejudice.
@Cahlenlee
Transhumanism I suspect you're right, sadly.
Prejudice I wondered if this was the case and he meant 'harm' or discrimination but I wasn't sure. "Causing serious prejudice" could apply to many things that people talk about that others think should be censored, stopped or attacked for. Brings up the issue of free speech.
I clarified my thought in a comment below.