This is another excellent question, one I hope to try to answer without controversy.
When men are in a group they seem to accept the other the way they are. We are not worried about what shoes, or dress, or make up, or how much we weigh. We do not compare notes first thing on who's who and what's what. We see that John wears Levi's and Jim wears Wrangler and we are cool with that. If we disagree about something we usually talk it out and when we are finished we can disagree and still be cool with each other.
Ladies, I think on the other hand do too much self comparison with the other and seemingly feel threatened by each other. If a disagreement is established then there is a little part of them that wants to feel better about themselves and they seem to begin to tear each other down a little quicker than a man does. They want to prove that they are better than the threatened feeling they felt when they first began.
Men still have disagreements but the resolution is reached without too many arguments. We may feel we are right but we can accept it as an opinion not a final resolution.