Working with
It's a small Internet, people, and very well indexed. People know when you bust out the insecurity. If you're nasty enough, people remember it. Every editor has a kill file, usually reserved for the sorts who write threatening cover letters (and yes, that really happens). Right now mine is one name long, the gentleman who made a threatening comment on this LJ last year. And believe me, you don't want your name featured in a kill file story told in a bar at a Con.
My recent high school metaphor received a very mixed reception. Here's another place it applies. Not tribalism or cliquishness, but the fact that just about everybody working professionally in the field knows each other, or are at most one degree of separation apart. If your temper gets the better of you on receiving a rejection or reading a bad review, for the love of Piet, don't blather about it on the Internet. At best you'll look like an idiot. It goes downhill from there.