Women generally want their men to be masculine, they are attracted to the masculine, and don't want to wake up one day married to a feminine man, or worse, a gay man or a transsexual man.
Women have a vested interest in having a mate who they feel will support and protect them. When we take on traits that in their mind, might make them question whether we will do that, they don't like it. This isn't rocket science.
Then add in those women who were brought up in a culture where they feel that our roles are set by their religious beliefs, and you have an even greater discomfort when they see their mate adopting anything feminine, because it strikes at the very heart of their very, very strongly held belief system.