That battle is perpetual. Lazy management sees a number that resembles a statistic, and try to use it as an easy metric for stuff it doesn't represent. Points do aggregate into velocity, which is worth measuring. But on their own, points are a proxy for estimation in $SPRINT_LENGTH days. The way to manage up is to keep making it clear that the smallest unit of estimation in Agile is the sprint length; points are used to subdivide that but only to ensure that the sprint itself is not overloaded and thus an accurate estimate.