Most of the time, I'd say don't waste your time arguing with flat-earth nutritionists.
The saturated fat issue is a tricky one. While I don't think saturated fat itself is a problem, I also think it is way too easy for people nowadays to get WAY too much of it.
The main issue, IMO, is a combination of too much fat and too many carbs (see American diets).
I'd really like to see a study on the effect of proper meat, non-starchy veggies, and a lot of oil (ie. coconut and olive) to see what that combo does to blood levels of many things.
Recently I decreased my sodium intake and my general fat intake and both my heart rate and blood pressure came down to my "normal" undergrad levels. I must say, that meant something to me. Sodium is another thing that we can WAY overconsume these days, even if it is real sea salt.