Get new friends or don't be insecure about what they think. I guess ragging on a damn phone is becoming less personal than dissing what people drive or who they date. There is another thread about iPhone 4 being so envied that deals with the same type of friends. Maybe both topic starters should drop their current friends and befriend each other.
I can go on and on about what makes iPhone 4 the best for me and for YOU. Design, quality materials used, Retina Display, battery life, camera, quality apps, ecosystem, software polish, updates, etc. I can even name its minor flaws. The thing is, you should already know this by now and the reasons why you got one in the first place and enjoy it. We don't need to give you anymore reassurance about a gadget that gets replaced every 2 years or so.
Be more confident or make new friends.