This is the SAME GUY myself and a few friends Always talk about on Teamspeak everytime we play in the server he plays in, He plays from morning till night from what it seems, with a few breaks in between, then plays some more and pretty much Only flicks grenades... I mean, seriously, you could walk up to him and poke him to death with a toothpick and he wouldn't notice, just sits there, flicking his grenades... I stand behind him sometimes just watching him and see if he turns around, sometimes he does and freaks out, flicks a grenade at me of course while I'm trying to poke him with a knife LOL!!
He's never been an asshole though, He might be a really big grenade whore, but I'd rather him just being a grenade whore than being a 10 year old with a high-temper yelling at everything that kills him.
Here's his routine when he's sitting in his many spots:
-Jump+Flick Grenade
-Jump+Flick Grenade
-Jump+Flick Grenade
-Jump+Flick Grenade
-Jump+Flick Grenade
-Flick Ammo Bag
-Reload Grenades
-Jump+Flick Grenade
-Jump+Flick Grenade
-Jump+Flick Grenade
-Jump+Flick Grenade
-Jump+Flick Grenade
-Flick Ammo Bag
-Reload Grenades
and so on and so on.........
Not saying he Only uses grenades, but 75% of the time, that 'routine' is what he's doing lol...
