"BOOSTED GOLDS", check their LOLKING, for example, search in google "AFK WARDING LOLKING", see the graphs, usually they were platinum or gold and now they are bronze. They spend lots of money to get boosted and after 20-30 games they go back to bronze or silver. Until riot doesn't make something to stop de ELO BOOSTING you'll see shit like this.
Anyway, try to play OP champs to carry, like katarina, riven, yasuo, zed, corki, veigar, kassadin, etc, it's the only way to reach GOLD I or Platinum V. After Platinum V you'll get good teammates, they dont flame, they ward, they advice you.
BRONZE - SILVER - GOLD = ELOBOOSTER/KIDS/FLAMERS/VIRGINS/HATERS
It's very hard to reach GOLD III-I if you don't play perfectly and carry/half-carry
Sorry for you, i hope you get rid of them soon