Someone who relies on spouting (at the end of the day - just words that anyone can) from the safety of behind their computer monitor, thus being 'brave' enough to spout what they like without fear of reprisal?
Oh and also stupid enough (or just deluded) to seem to genuinely think that they are achieving something?
Cue of course - I have been reduced to talking about them so it is in fact a win for them/I've been annihilated/etc