I think when it comes to the different aspects of gender variance, the tolerance issue comes into play when there is a feeling of being marginalized. I think all sides are guilty of this, although I think most of us are not necessarily intending to do so. It may be because of blissful ignorance, or lack of knowledge when we are seeking it, or who knows why, but I think the problems and negative emotions hit when we do feel this feeling of being marginalized.
I can see where someone who is TS and going through preparations to transition, social transition.... going through issues with their partners and other family members, and along comes a CDer who proclaims that they are just the same BUT, their circumstance prevents them from doing so, or worse, that they will say something like, I love my wife too much to transition and gutting it out.... YIKES, because I can see right there how that is going to make someone who is going through all of what they are feel marginalized. On the same token though, not ALL of us who are not TS are simply dudes in a dress, getting our jollies from wearing panties to bed, or prancing around in 5 inch heels or whatever. We too have our own gender issues, and it is powerful enough that we buck society and have most of the world against us. I am not in any way saying it equates. I am just saying it is powerful enough to make us go against the grain and take a lot difficulty in itself.