They have a nonemotional aversion to talking to you.
They have a nonemotional aversion to the subject.
The intersection is often used in practice: “They have decided that they do not wish to speak to a given individual on a specific subject” (while they will talk to that individual about other things or that subjected with other people).
The intersection is often used in practice: “They have decided that they do not wish to speak to a given individual on a specific subject” (while they will talk to that individual about other things or that subjected with other people).