I agree it is so disrespectful, and shows a lack of maturity. I refuse to play Pvp with people who do this, I kick them if they are on my fire team. If you kill me in Pvp, good for you, but show some respect. It's poor sportsmanship to do this, to me it's the same as if you tackle the quarterback in football, and then spit in his face, it's the digital equivalent.