Happened to me recently during a call. Perhaps they could have phrased it better, like “why are you open to opportunities” (which sounds quite dumb too tbh)
Except that you can effectively screen for basic interpersonal skills with a casual conversation of 15 to 30 minutes where the interviewer throws in some flashpoint / hot topics and asks a few more pointed or consequential questions after a general report has been established.
Or better yet, do that with their possible coworkers, or get said coworkers to suggest topics and questions for the recruiter in the above scenario.