Has it ever been easier to experience an emotion at the click of a mouse? It's a choice.
You can instantly become enraged, merely by reading the comments of some blogs. You can amplify your self-doubt by checking out what the trolls on Twitter have just said about you. And if you're really interested in bringing yourself down, go read some reviews of your work online.
Sure, if you want an argument, it's easy to find a never-ending one online.
The question is, why would you want to?