Deviance

I think its really strange that one person can think that its normal to talk to yourself, for instance, and another person can look at you strange because of it. Is it a person's childhood that make them this way? Their peers and teachers? I guess it really could be anything. any experience in your life where someone reacted negatively or positively to something someone else did. Its endless! I happen to sing in the car alot....I have fun. my philosophy is that you only live once and who the heck cares what other people think........i guess the fact that i have this philosophy means that i know people react negatively sometimes. I just choose not to care cause singing makes me happy. lol. i guess were all deviant in our own way.
anybody agree or have an example?