I've rarely experienced the kind of negative reaction from someone of the same or smilar belief system, but then the group of people who helped me find my path were good friends and comfortable/confident in their own knowledge and paths. I think that has a lot to do with it. People become self important, others become overly cynical. If you have no faith or respect for your own beliefs, or in yourself for that matter, how can you give strength, advice, or anything but negative feeback to others. Others probably fear that they are not as 'intune/wiccan as they pretend to be' (this fear proves it). Jealouy, pride, fear, anger- pieces of human nature that we fight with in everyday life, they cause us to do some petty things.
Sorry about rambling, those are my thoughts on your question anyway.