Dairy, if unpasteurised/unhomogenised from animals fed on grass and especially, fermented, is extremely good for you! But there are some instances when even raw dairy can be problematic for some people, either temporarily or long term. Here 'AskWardee' who is a traditional food cook, goes into detail about why some people may need to avoid dairy and which type of dairy is the best for everyone else. A1 and A2 milk differences are also mentioned.
I love my fermented raw milk kefir and feel amazing on it and there's no need to miss on out this health food even if you are lactose intolerant, as the bacteria which make the kefir live on the lactose in the milk, so there is no lactose left when you drink it!