Life is rather too short to spend it getting angry at remote strangers.Bryan Caplan:
To which I'd add: It's also too short to spend it getting angry at petty slights, not-so-remote strangers, friends, family...
You might say, "Unfortunately, it's impossible not to waste time getting angry." To which I respond: You may be unable to avoid being angry, but getting angry is much more under your control.
Alas, I find it considerably easier and quicker to accept anger and move on. Read it, hate it, and forget it.