Silence is golden?

There are days where there's just way too much noise around me and I just don't have the patience to deal with selfish people. My tolerance for people who care about nothing but themselves and their appearance and what benefits they can get out of anything has decreased over the past few months, and nowadays instead of actually layaning them and doing things for them, I've learned that it's best to shut up and ignore them. I guess you could say that it's being mean, but why contribute to their carelessness? At times, I wish I could retreat into a shell, like a hermit crab. I'm not in a bad mood right now, although it may seem like I am. I'm just annoyed by how some people can be so full of themselves without a care in the world for anyone or anything else.