Dairy has more calcium than other sources, but you absorb it more efficiently from other sources. That said, I am unconvinced by the arguments that dairy is bad. My biggest concerns about dairy are the hormones & chemicals, which is an argument for local & organic dairy, not for cutting out dairy.
A friend asked me to read the Blood Type Diet. The idea is that your blood type can tell you the ideal diet for you, and that might be vegan for one blood type and paleo for another. Seems pretty silly to me and the evidence was unconvincing, but the idea that really resonated with me was that our ideal diet is individual. Paleo might be great for some people but that doesn't mean everyone is going to thrive on paleo. Or vegan. Or whatever someone is trying to push on us.
I suspect my ideal diet leans toward paleo but includes whole grains and dairy.
2009 Trek 7.2FX WSD, brooks Champion Flyer S, commuter bike