About a year ago, early on in my transition, a male friend was telling me of a conversation with his father-in-law, who had known me for many years. This older, very traditional male was having trouble with the idea that a person he had known as a man for over a decade was now presenting as a woman; had changed her name to reflect that and so forth. He was worried, wondering what would happen when he saw me, because this was so far outside of his comfort zone. He didn't think it would be possible to accept me, because he couldn't understand such a change.
My friend explained to him that it wasn't really important to understand what was going on with me. It was enough for him to accept that what was going on was right for me.
Quite a few years ago my wife and I were in a restaurant, waiting for our meal to arrive. A group of 'ladies' were ushered to a nearby table. My wife assumed they were crossdressing and made some negative, judgement-filled comment. She then turned to me and expressed great embarrassment at the thought that I might soon be doing the same thing.
Her reaction might have seemed to be typical since none of these women were doing a lot to conceal the fact that they were men dressed up and having a good time pretending to be one of the girls for the day. I wish that I had found the words that my friend found. I would have told my wife the same thing, "What they are doing isn't hurting us - it's right for them. We don't have to understand."
There are times in our lives when we have to decide how we will act in difficult social situations. When we don't understand the way someone lives their life and we need to interact with them, then we should accept them without explanation or if we are interested and caring enough, try to find out more about what it is like to be in 'their shoes'. It seems to me that choosing to discredit another reflects more upon our character than theirs.