As has been noted elsewhere, there’s something about the Internet and its inherent anonymity that brings out abusive behaviour in too many people.
Treat others as you would like to be treated isn’t a particularly profound principle. You can derive it very simply if you accept that a world in which you are treated well is better than one in which you are not. Let’s leave that derivation as an exercise for the reader, shall we?
Sadly, there are so many examples of abusive behaviour online that one can only highlight a few. Relentless bullying of teens, to the point of driving the victim to suicide, is all too well known. Twitter personalities such as John Scalzi and Wil Wheaton are frequent targets. Writer Mary Robinette Kowal was famously the subject of abuse from a fellow writer not long ago. And of course, there’s the recent GamerGate debacle which targeted women in the gaming community with vociferous, hateful abuse.
Oddly enough, writers of fanfiction are also subject to their share of abuse. This is particularly puzzling. After all, people write fanfiction because (a) they love the subject matter, and (b) they love to write. They (we) certainly don’t do it for the money. And for this they receive abuse? Really?
It seems that when you put yourself and your work out there, some of the more misguided amongst us take it as an invitation to hurl abuse. Why is that? Are they trying to make up for their own inadequacies? Does it make them feel good about themselves? Odd if it does, because words frequently associated with these individuals include “troll” and “coward”. Not qualities one would normally aspire to, or so you’d think.
It’s entirely possible to disagree with someone in a respectful way. It’s quite alright to provide a writer with negative feedback if it’s done in a constructive way. (“It might improve the story if you deleted scenes C and E.”) But abuse? There’s no place for it at all, under any circumstances, for any reason.
Do you really want to be that guy?