Community is uncomfortable; when you’re dealing with other people there’s no way to avoid getting mixed up in each others’ emotional states at least a little bit. Even with this comment that you made and I’m now responding to, we’ve given each other a small spot in our emotional space for the day, and it’s our responsibility to at least take that fact into consideration. You don’t have to be nice, but if you want to interact with people, even online, you’ll find more success if you think about their feelings as much as your own.