Part of "faking it" is how you hold your body. Standing up straight, smiling, open postures and so on help you feel good and confident. Crossing your arms, slouching, scowling all make you feel small and less confident. It's a well documented fact that how you hold your body affects how you feel.
The truth is, cats can be jerks. And so can we. The question is, will you let that stop you from being you and getting what you want? Doesn't it seem like no matter what we do, someone will think we're acting inappropriately, being mean, going against the grain, being selfish, not doing enough, being too big (or small), dreaming too much (or not enough or even wrong), too political, going overboard, not trying hard enough and so on? So if others are going to have an opinion no matter what you do, why not do what makes YOU happy?