If you're a Cipher and block the Spindle Man's access to your mind, when you later offer him a secret to trade, the cloaked elf says, "Yes. You have been generous with us," and the dialogue ends with no other options available to the player.

Seconding this. 

+1

+1. This is extremely annoying.

Crud. I only just noticed I posted this in the wrong subform. Mods???

If you're a Cipher and block the Spindle Man's access to your mind, when you later offer him a secret to trade, the cloaked elf says, "Yes. You have been generous with us," and the dialogue ends with no other options available to the player.

It didn't for me with my Witch PC. I later lost the option to trade secrets when I chose the joke secret of "I'm not really left-handed"