the way I figure it, you can't really be upset if someone you met in a bar doesn't call, or gives you a fake #. They spent what, maybe an hour, while drinking, talking to you? They don't even know you, know what they are passing up.
Now, say you're at a small dinner party and spend the whole night clicking with someone who is a friend of the friends having it and they don't call you or blow you off when you do call-- that isn't cool. In a setting like that, you come with references--ie: the interested party knows your friends and can call them to ask about you, check your 'references' so to speak.
I'm personally finding that the older I get the more I only want to date people that come with references. You have something in common as a starting point, and having that something or someone(s) in common you both tend to treat each other with more respect knowing that your friends are looking out for you...
Of course I say all this as someone in my early 30s. The college thing is certainly MUCH different. But its also MUCH easier to meet people when you're in college than when you're older--and the older I get, the harder it seems to meet people. My friends and I ask all the time WHERE are all the intelligent, educated, tall, cute, funny, single guys hanging out--we'll go there! ha ha
Amy