I know how it feels to want to spread the word...
However, my advice is don't waste time and effort trying to get it through their heads. You'd be banging your head against a brick wall, believe me.
Just smile, nod and ignore... and hope that some with open minds will start to express an interest once they see the long-term results.
F 5 ft 3. HW: 196 lbs. Primal SW (May 2011): 182 lbs (42% BF)... W June '12: 160 lbs (29% BF) (UK size 12, US size 8). GW: ~24% BF - have ditched the scales til I fit into a pair of UK size 10 bootcut jeans. Currently aligning towards 'The Perfect Health Diet' having swapped some fat for potatoes.