Well, lets do basic math. He has 2 days played, almost 600 SPM overall in combat record, lobby SPM of 200, a 0.50 W/L, a 3+ KD, shotguns/pistols/crossbows/shields have 3+ KDs, snipers have 13+KDs, most crappy guns will have 5KDs, they will laugh or leave when you call them out in pregame. Their showoff cards will be the 8+Rapid kills, weapons mastery complete.... sometimes 30 kills without dying (not difficult to get in the right mode)
During game they will show you exactly the type of 3.5 KD player they are and probably go negative playing with a diamond primary and diamond pistol. They will quit before the game is over. Message them what you will and then repeatedly report them for boosting/cheating.
Grow a set you faggots, you're almost as bad as people still using Ghost this many games later who still think they're good.