Allah swt knows. Your earliest memory, the people you love more then you can say, the swear words you utter under your breath, your deepest fears, the music you secretly like, what you actually do all day, your regrets, every action, every intention whether in private or in public.... Allah swt knows everything about you. He is the One we aim to please and we can hide nothing from Him.
Still, we can hide things from other people, right? Not just hide those things but pretend we never, ever do them and look down on those who do. We can aspire to be an image and think that the closer someone is to that image the more perfect they must be.
I will put this simply. I know excellent, pious Muslims who don't watch t.v, don't listen to Music and dress in a traditional manner. I also know Muslims of equal sincerity and piety who do listen to music, wear western clothes and never miss an episode of Lost.
People attain nearness to Allah swt in different ways. It is an individual journey and it as individuals that we will be judged.
We are angry when others demean our faith, yet by attaching such importance to little things, by assuming piety is measured in inches (beards, hijabs e.t.c), we demean it ourselves.