Because everyone that plays MW2 with a sniper rifle, quickscopes (untrue)
I remember playing an S&D game a few weeks ago, and because I was bored (I was 8 - 0) and it was the last round, I picked up the sniper that my most recently slain enemy dropped (FMJ Baretta) and went looking for the last guy. I finally found him, scoped in, took my time, and blew his brains out.
I immediately un-muted both teams (I play MW2 with everyone muted so I can soundwhore better), and the enemy team was "that kid's so bad, he hardscoped"
Lol, so I turned on my mic, and said "he's dead isn't he? It only took me 1 shot, not the spray and pray you cunts always do when you quickscope"
So the next game, just for spite, I sniped with my Intervention FMJ the whole game. I didn't do as well cuz I can't quickscope, but I still got 3 headshots, killed 2 bomb planters, and killed a guy camping on a claymore, with his claymore. After the game, I said "so, what was that about me being a bad sniper?" and they all left xD
The last time I accepted a 1v1 match, the guy invited 2 of his qs buddies to watch, and I used my UMP rush class (ninja, marathon, lightweight), and I got 50 kills to 6 deaths. I fail to see the point in any other 1v1 games now, since all the gametypes I play on MW2 are team-based.
So yeah, get used to people on MW2 being elitist cuntbags whenever you snipe properly.