When introductions are being made, people are kind of standing in a circle. I've seen women close the circle to exclude another person. That is so RUDE!
Being treated like you are invisible/talking to someone and their eyes are searching all over the place (like Dionysus mentioned-not looking you in the eyes) for someone more "interesting" or beneficial to them than you.
Young people can do this to parents or the more mature generation as well.
One thing that actually happened to me-At a party a I was introduced to a newer "member" (new bride, new shoes, new law practice and a LITTLE bit of new money) and she responded, "....I've never heard of you."
Of course I shot back something like-"That's not surprising. We are very discriminating when it comes to socializing." She took it as it was meant-jaw drop and all. Her husband now chases ambulances.
edited-Over the years, I think I've seen women behave more abominably than men. Men seem to realize that you never know when you will need a connection. Women, especially in the 25-34
year range tend to place way too much emphasis on Hubby and don't realize that established/mature women operate in a more quiet way yet wield a lot of power.