To me it sounds like a sloppy instructor. How many of us has not missed a text? Had you not seen the text and showed up with nothing you'd been blamed as well, most likely. Possibly charged for the session too.
Time frame wise I don't know.. what does he expect? 6 points on a chart certainly goes quick, but is that his idea of a VFR flight plan?
That said, in the future you will not always have the benefit of time. Being able to prioritize what's important and preparing what's required will be the norm.