"'It's more than strange...' says Wordsworth." It's actually a little bit frightening. But he's not going to tell Joker that, not when he himself has been called names and treated as a freak. He knows how much it hurts, to scare others.

Besides, he's not scared of Joker. He's afraid of becoming further removed from human more than anything. He's afraid of being treated like a freak again. Maybe here it's more acceptable, being different, but it's still something he's not looking forward to.