I find that people look at my bike and aren't interested because they don't know what it is. It doesn't say Trek or Specialized so it doesn't mean anything. I rode a friend's Tarmac for a day and had a ton of people smiling at me and trying to make friends. Even though I have a $3,500 bike, they are more interested in the $1,700 Tarmac and will talk to him and act like I don't even exist.
People also look at my legs funny.