It is just how certain people are. Everyone thinks their dog is a great breed or they would not have that breed of dog. There just happens to be a lot of lab owners out there so that is why you hear it so much.
There is a perfect breed of dog for everyone's tastes, activities, preferences, etc. The "perfect dog" is the particular dog that you have researched and come to the conclusion that it is the perfect dog for YOU, not for anyone else. The person buying the dog needs to know specifically what they want, and if they do, and they get that dog, then yes, they have the perfect dog for their individual tastes and activity level and preferences.
My perfect dog is Brady. He is an active dog, and I am an active person. I like big dogs, and he is big and loveable and cuddley. He has a lot of fur, but I don't mind because I have laminate flooring so I just sweep it up and I brush him every day. I have a crazy sense of humor, and so does he, which I just really lucked out with that.
Also, it is not lab owners that call Rots and Pits evil, it is ignorant people. There are many wonderful lab owners that I know that know and understand that it is the owner not the dog that can make the dog or break the dog per say (or is it per se). People in general need to be educated on that subject, not necessarily lab owners. Brady's girlfriend is a lab, and she IS a GREAT dog, she is AWESOME. Brady and she are a perfect match in their activity level. Her owner is just like me and knows that only uneducated and ignorant people (on that particular subject) think those type of things.
I don't have just one breed that would be perfect for me, I have several that I think I would really like, but I would never say one is better than the other, that is discrimination. I love all dogs, big and small, short fur and long fur, active and lazy.