Really?

Will Baude points to Daniel Drezner's writing guide and wonders, with some puzzlement, about where to find all the professors who "say that the only important thing in a paper is the ideas, and therefore typos, grammatically incorrect sentences, or sloppy style are irrelevant" (Drezner #6). I didn't meet any at the University of Chicago. I have met quite a few professors who rarely, if ever, mark the grammatical errors, which understandably leads students to presume that their errors don't "count." (I'm not one of those professors.) Some non-English professors have told me that it's "not their job" to teach writing skills per se, which has always struck me as self-defeating, not to mention likely to result in frustration-induced ulcers. Perhaps these are the people that Drezner means.