I definitely think crossdressers are demonized by transsexuals. It's petty and stupid. Many will also make broad statements about crossdressers' motivations without actually listening to them. For example, statements like, "Crossdressers see themselves as men" or "They just do it because it turns them on." have been posted right in this thread by transsexuals.
Crossdressing can be a fetish for some, the feel of satin or stockings or lingerie can be arousing. Some go on to become transsexuals. This whole idea of "crossdressers do this or that or feel this way" is far too broad to explain all motivations.
However, at the risk of not heeding my own advice, let me make this statement: "Crossdressers are women, even if only part-time." The whole Tri-Ess name belies this ~ "The Society for the Second Self". In Jungian psychology, we have a model of the opposite gender living in our psyche which can be expressed as "the perfect woman" (or man) or by outwardly dressing that way to express that part of themselves.
Transsexuals think that crossdressers give them a bad name. Seriously, if people can read you, you are a "man in a dress" (not that there's anything wrong with that), no matter how you identify. Belittling crossdressers doesn't help you pass any better. Deal with your own life first.
Interesting conversation I had the other day. My friend (GG) and I had just gone shopping and I bought a new bra (at the thrift store), it was a bit lacy and she was sorta teasing me about it because I tend much more towards the very simple black or white ones, not light blue with clouds and flowers and lace. I told her I like being girly sometimes because I'm a crossdresser like that. To which she responded her usual of, "You're not a crossdresser, you're a girl." *grumble*
Anyway, she said that lacy things are good sometimes. She has certain panties which she wears sometimes under her normal clothes so she feels sexy all day long. I said that's no different from crossdressers who wear panties under their normal clothes so they can feel sexy all day long. Who wouldn't want that?
So y'all quit hatin' on crossdressers. There's no clear line between crossdressers and transsexuals. Live and learn, you'll figure it out.