Which community can you walk into telling everyone that everything they care about is shit and they are shit and will never make it, and they will take it prod

Which community can you walk into telling everyone that everything they care about is shit and they are shit and will never make it, and they will take it productively? I Certainly admit that some Linux users are heavily in denial about linux's flaws, and don't take criticisms healthily, but this is a trait in humanity, not just in Linux users. If your version of diplomacy is starting off a meeting with urinating on their flag, don't say diplomacy never works because no other countries can take criticism.