Really? Worse than people attacking for example your dignity, religion, ethnicity, or people you love, etc? If you think so then you have a serious flaw in your character where the game matters to you more than anything else in life. And where a simple "early GG" becomes such a dishonorable thing to say and pisses you off.
VonIvan is clearly stating that within the confines of the game a premature "gg" is considered rude, The examples you listed are an unknown inside the game and not relevant.
Let's stop trying to pick fights.
Thanks.