I have played around with chatgpt and coding (I even have the paid version), but I fail to see it used as anything else than a brainstorming tool (at least right now). It writes code, that is often wrong and even if right it has the quality of a very new junior developer.
But again, I also don't like IDEs (and use "unix is my IDE"), so it might just be personal preference...
This will probably be the one who doesn't use AI. But I know that even that guy will probably use AI if he gets really stuck. It's just the rational thing to do.
Given that AI tools make you more productive, you can ask the candidate why they refuse to use it, and see if they give a satisfying answer.
If someone said that they have stackoverflow blocked and refuse to use it under any circumstances, that would be a bit of a red flag - the refusal to use AI assistance is in a similar category.
I would want to hire people who want to get things done in the most efficient way possible - refusing to use tools that make you better at your job is a sign that maybe you aren't that type of person.