The key to nailing this interview question lies in providing an authentic response, describing an aspect of the role that isn't a key requirement, and convincing your interviewer you will do your job at a high level even if you dislike a task. Here's how those three components break down.

First, be authentic. This question can sometimes be a test of your ability to be honest with your interviewer. When hiring a project manager, many hiring managers value candidates that inspired trust immediately in their interview. Answering this question truthfully helps you do exactly that.

Second, it is important to describe your dislike of something that is NOT critical to your success as a project manager. For example, I would not consider hiring a candidate that told me they despise planning, budgeting, leadership, or communication as all of those aspects of project management are critical to success.

Finally, you want to demonstrate your ability to self-motivate and self-manage. Managers will often hesitate to hire someone they feel will take a lot of work to manage. Convincing your interviewer that you are prepared to do whatever is necessary, even if you hate it, will boost your chances of leaving a positive impression.
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My least favorite aspect of project management is scheduling meetings. I used to spend a lot of time juggling schedules and rescheduling meetings when conflicts occurred. I have made several process adjustments to find windows for recurring meetings. I use group chat in Slack when possible, and I make sure we have a clear agenda and the right attendees involved before scheduling a meeting. All of these strategies have helped me to minimize the administrative work and ensure that my teams get the most out of the time we spend in meetings together.