It's called nerd-rage.
It happens when a normal person goes on a forum and begins to talk smack about a person or the game the forum is based on.
Then a nerd reads the post and get enraged, thus creating nerd-rage.
The nerd cannot physically harm the post author so he/she/it begins to type in all CAPS and and lots of "!!!" marks thinking the author will feel hurt by these replies.
The author just "lols" and continues the "rage-fest"/"flame-fest" until a mod comes in and saves the day.

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omg some1 is using my forum name on Pacific and hes botting
noob foreigner wrote:
durka durka durka we turk mama fook