Are women more offended by the term "Nice guy"

Everytime I read a post on nice guys, it seems as though women are more offended by this notion. Especially if they are with a nice guy at the moment? Why is that? I find many men accept this term and are more open about their transition from one where women feel that it's more of an attack on them and who they are as a person for choosing one. I don't understand. If you have a nice guy why not be proud? What is it about having a preference for a nice guy that you need to justify your actions for dating one or just defending one period?

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