When presenting the three projects, I gave pros and cons about each one, like "you'll get to learn this new piece of technology" or "a lot of people will be happy if we can get this working". Absolutely no reaction, just "I don't care, pick one".

This guy claimed to want to get promoted to Senior, but didn't do anything Senior-shaped. If you're going to own a component of a system, I should be able to ask you intelligent questions about how you might evolve it, and you should be able to tell me why someone cares about it.