When you underplay a problem that was brought to your attention, you are compromising the relationship.
You might have very good reasons to do that. Perhaps the problem is not a problem to you. Perhaps you are scared the problem might jeopardize your status. Perhaps you just have no idea what to do about it. Perhaps you are set on your goals and targets and do not want to get distracted.
You pretend it is not there, and the other person is impatiently waiting for your response.
You just have to ask yourself: is it worth it?