I think that crossdressing may be considered as a threat to the masculine ideal, The supposedly ideal in that a man never cries, he must protect, he must show strength, he must never back down from a fight, he must be loyal and supportive. To me this ideal is very hard to change, in particular when some males may show weakness but hide behind a mask of so called neanderthal mentality. I am strong, I will put down anyone who says I am weak.
This means that a family who is heavily based on the ideal man may become furious if there daughter marries a guy who does not conform to their ideals hence conflict. It is very sad that so many problems arise from the "ideal male" and many forms of "maleness" have evolved, only to be suppressed by the "ideal male".
Unfortunately this attitude may take a long time to change, but with so much confusion about who crossdressers are, any change for the better will take much education and that takes time and commitment.
I think that anything "out of the taken norm" will be considered as a threat from a closed society and that is so sad, but heck didn't poor old Copernicus have a problem putting forward his ideas on a sun centered universe and not the earth?