In my personal experience, I have found the reformists to be the more vitriolic of the two parties. Puraatan Sikhi is inherently more comfortable with those that offer divergent views or practice Sikhi in a different way - the disparity of the various samparadas that constituted the Old Sikh world is testament to this. None of them, in spite of their vast differences, dabbled in the business of who was a Sikh and who wasn't. Only the Indian faiths are so paradoxical. This accommodating nature was lost when Sikhi started to take on accretions from Anglicanism after the Tat Khalsa Singh Sabha gathered momentum. Even notions about Waheguru changed. He was no longer considered to be a numinous, ethereal force, but acquired anthropomorphic properties like the God of the Bible, issuing commandments and very specific sets of rules which could not be infringed upon. Sikhi became more totalitarian as a result, and the infighting between sampardas and jathas is the result. The missionaries place the very highest emphasis on Gurbani, they even whitewash or modify Sikh Itihas to make it compatible, as they see it, with their very specific interpretations of Sri Guru Granth Sahib Ji, The traditionalists, as their name suggests, respect Gurbani but place exceptional value upon history and heritage which they consider to be as immutable as the Bani itself. On the one hand, being propelled onward by the momentum of a developing world is an excellent and necessary thing, but on the other hand, if any one of our traditions can be discarded in order to better suit the times in which we live, then who is to say a time will not come in the future when it is thought that they all ought to be? Similarly, respect for tradition is instrumental in preserving a distinct Sikh identity. But when some of these traditions are of unknown or questionable origin and appear to be wholly antithetical to our Guru's Bani, keeping them in spite of these very great misgivings is tantamount to a corruption of Sikhi. I think the solution lies vaguely in the middle of the Sikh religious spectrum, though I can't say where.