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Its not intrinsically bad. It often goes along with some issues that are likely a bad thing though.
The problem is most girls aren't lesbians. Guys are quite happy to date someone who is a friend and also physically attractive. Women for the most part like men who exhibit a certain level of masculinity (how much depends on the woman).
Guys who only get along with women are often too 'soft' (this is a habit not just who they are) to hang around and be friends with men. And that issue than makes then only friends with women.
Another way I can put it is that a lot of women will befriend but not date guys who seem like sweet nice -boys- But they can't teach you how to be a man.