Unfortunately Kate, that's increasingly the internet writ whole as it brings out some brutal tendencies in people and has us talking to each other in ways we never would in real life. Adult conversations are filled with grey areas, respect and nuance - while too many people just use it to scream to be heard.
It's akin to taking the subway and thinking everyone should pay attention to the drunken homeless guy with mental issues screaming at ghosts.
Like most people whom post, I ain't perfect but like the vast majority, do try and be respectful and calm. Not every post I write is great and I definitely have been a jerk at times... but mostly, even on-line, the overwhelming majority are decent. For my own peace of mind I try to chime in every once in awhile, as I like talking sometimes, while trying to ignore that guy peeing in the corner.