AFC boss Neal Ardley called the 3-1 home defeat 'naive'.
It was all the more disappointing after Ade Akinfenwa had appeared exactly where the striker needed to be after just 59 seconds to put Dons ahead.
In the sun, AFC turned on what heat there was at a chilly Kingsmeadow without adding to the lead, much to the manager's frustration.
Thereafter, things went south as average defending saw the Cumbrians crash home two headers with Dons doing all the legwork as they chased a leveller.
It was no surprise when United hit on the break in the final seconds to wrap up the points and leave the manager cold over his team's shortcomings. Judge for yourself.