Do you think of yourself as a Python programmer, or a Ruby programmer? Are you a front-end programmer, a back-end programmer? Emacs, vim, Sublime, or Visual Studio? Linux or macOS? If you think of yourself as a Python programmer, if you identify yourself as an Emacs user, if you know you’re better than those vim-loving Ruby programmers: you’re doing yourself a disservice. You’re a worse programmer for it, and you’re harming your career. Why? Because you are not your tools, and your tools shouldn’t define your skillset.