I doubt it has anything to do with cops or guns, in particular. All kinds of people say incredibly ignorant things, about anything you can imagine.
On rate of fire, the reports indicate that the Aurora shooter can be heard on 911 calls firing 27 rounds in 30 seconds. I'd say that's a reasonable max rate for semi-controlled fire. 54 rounds a minute.
In regards to this specific incident, I would consider contacting the school and the agency to correct the record, anyway.