Expertise? I hope you're not suggesting I've become the go-to admin for topic  bans? Dreadful fate. Either AN or ANI would work. Theoretically, community topic ban proposals are supposed to go on AN, because they're not about one incident, and because AN isn't archived as quickly. But the preference for AN is becoming more and more a dead letter. In practice proposals for topic bans are often put on ANI, perhaps because it gets more traffic, or perhaps sometimes because it's the only admin noticeboard the OP knows about. 

However. The user seems to have resigned themselves to consensus and is apparently on board with the DR being closed. In such a situation, you're never going to get a topic ban just because they're rude. It's rather strange the way they've been attacking you, I agree, but I think the best thing you can do is walk away. I've put a note on their page to urge them to disengage too.   | talk .