I think it means to say... be yourself, it will only bother those who don't like you anyway, as those who do (like you for you) won't mind at all :)
Some people like clowns, some don't?
Some people like silence, some don't?
Everybody is different, but birds of a feather, will always flock together, and in such cases, there will always be outsiders..
This saying also applies well to peer group pressure... Is anything really worth sacrificing our sense of integrity for..?
Be yourself, it may not make you popular, but at least you'll know who YOU are :) and then you can start your own flock :)
Peace to all :)