Therefore, I shall.
I think that crossdressing in itself is not inherently insulting to women. I can see, as has been previously posted, that many CD's are dressing because they love and idealize women. So, in the generic sense, no crossdressing is not insulting.
HOWEVER...........
There are some CD's whose intentions may be pure, but whose carry out can be incredibly insulting.
Examples:
Messages that we GG's aren't living up to our potential if we aren't dressed a certain way are horribly insulting. We can't always wear what some CD's fantasize about when they think of feminine garb. Practicality keeps me from wearing a lot of the things that my CD SO wears. I am no less of a woman because of that.
Mimicry that misses the mark and is actually a hurtful parody can and is insulting. I know that again this is a fantasy ideal, but sometimes I see what some CD's feel is feminine, and it doesn't come across to me (and other GG's) as flattery. It says to GG's that you see us as cartoonish parodies and we may feel mocked rather than flattered.
Implying that only by having sex with a man can a CD truly feel like a woman is insulting. I have many women friends who have never been with a man. Either by choice because they are Lesbians, or because they never had the opportunity and probably won't. To say that a woman is only a woman if she has been sexual with a man is HIGHLY insulting.
Let me clarify this by saying a few things. I dont believe that most CD's mean to be insulting if they fall into these (or other) categories that GG's find insulting. I don't feel that any insult is intentional, which is why I usually won't call CD's on the insult. I think a lot of this is wrapped up in that dreaded pink fog. I am sure that most of the CD's who are wrapped up in said fog are perfectly reasonable and pleasant people when not befogged.
I agree with some that there can be "territory" issues. But, honestly, unless you suddenly buy some implants and lose an appendage.....we really can't compete. Because as good and passable as some of you may look, when the skirt comes off.....I have something you don't that will always trump you when it comes to the territory issues
(please take this statement in the vein it was intended.....smile a little ladies)
Consider also, wives (such as that of the OP) may have reservations because they associate CD'ing with Transvestism as personified by RuPaul and others. While I think RuPaul is a hoot, she is a little over the top and that can be insulting to some women. That isn't what GG's are really about.
Unless you are either Cher or Bette Midler. And they are in a class all their own
So, easy answer, no Cd'ing isn't insulting. Complex answer, some of the behaviors can be.