Most nutritionists will tell you this. It has been the status quo for a number of years and at this point I'm pretty sure most of them are just parroting information. If you look at specialized athletic associations (i.e. the Olympics), they will recommend 1.5-2g/kg body weight. However it has been shown that even above 2g/kg body weight doesn't have a negative effect on healthy individuals.
Now if he had said the average person consumes to much red meat then sure I would agree with him. The majority of people should eat more lean meat along with fish.
As for specific studies that refute what he says I'm on vacation so don't have my library You can check out what I posted below, your library might have/can get it. It disputes alot of common "nutritional expert" advice with studies you can look at yourself. Its also worth buying in my opinion. I'm not bashing the guy that gave the lecture I just think its funny that they're spewing the same shit they have been since the sixties about protein. The body can process it (even in excess). Depending on what you eat its a much more efficient food and it burns more to process than any other foods. I just don't get it.
Essentials of Sports Nutrition and Supplements
Don't go by the amazon review the guy is a moron.