The biggest thing with BF is *insert gun here* noob. Can be anything. You can kill someone from across a map, a 1km headshot, and you'll be a sniper noob. This doesn't reflect on you, this just seems to be common practice.
Then there are those who are just loud mouthed in general. Just the other day I join a match of Conquest, was something like 100-400, we were losing (Caspian Border, half our team were sniping from the new towers in the new wall). e lose the game, this dude pipes up "LOSERS".
Naturally, I start trolling him. "Yeah, you beat us so bad, I wish I was as good as you" and all that.
He goes on and on, eventually he replies with the generic "yeah yeah, blablabla".
I check the scoreboard out of interest, he's 8-9. I mention this, and the whole lobby gets a lol out of it. He didn't reply after that.
//Thank fuck I just had a good match and went 15-9, otherwise the joke would've been on me.