He should understand that sometimes things don't line up with a FA addition. If anything that shows me some lack of maturity on the part of the coach. Keep that stuff to yourself man. Or between you and Jackson. No need for airing your grievances unless it's going to give you some sort of benefit.
Now maybe that's his way of motivating the player. But if Jackson needs that from you then he's probably going to let you down at some point. Worry about winning games, because in this league you can go from being a hot commodity to not being hot quite quickly. I don't think throwing barbs at McVay and Snead is wise or worth the effort.