There is such a thing as sissy fetish crossdressing. I've done this kind of crossdressing on ocaision. I guess "sissy" is an OK expression if it's used sparingly and with a sense of humor. Really,in referance to things LGBT/TG/TS/CD "sissy" belongs only among ourselves. Outsiders shouldn't say "sissy" but I know you can't cure people of something like that.