Confusing Idea of the Day

I'm sitting at the first morning session of an AP Lit/Lang. Conference. One of the college professors here as a presenter/facilitator spent about 20 minutes telling us that our high school students come to him able to write, but not knowing how to contextualize their writing. Hm. It seems to me that contextualizing one's writing is a college skill, so it might therefore follow that students should learn how to do this once IN college? The professor seemed really bothered that "we" (high school teachers) have underprepared our students for this writing skill. To me, his argument is akin to me complaining that my undergraduate studies didn't adequately prepare me for my first teaching job because I still had things to learn once one the job. Methinks that friendly-AP-college-professor-guy would rather assign things to his students than teach them . . .