Any time one looks down on the other is because of insecurity within one self. Pretentious behavior and prejudice are the fruit of such fear of others, and fear of self, having unresolved issues. No surprise that transgender folks would fall into a "unresolved issues" category, but it is not reserved only to us but also to the entire population at hand.
I would suspect that in fact transgender population has way lower instance of such behavior because we had been exposed to prejudice our selves and know how much it can hurt, therefore, grow more tolerant and accepting.
I for one accept any form of human expression because I know that acceptance is the most basic of human needs. This isn't to say that I am any sort of a saint

NO, in fact I do have moments of doubt, and seeing a crossdresser making no effort to seem at the least feminine and then making a comment to me about me wearing jeans and not "the proper attire such as a dress" drives me nuts at first! But then I smile, perhaps say "it isn't clothes which make the woman" and resume the conversation wanting to know more about the person and perhaps their story and why the world is the way it is.