Well first off I can tell you that there are "downies" in every elo bracket so get used to it. The only difference I believe is how much your team wants to win (generally).
Disclaimer before I give advice: If you're ~900 elo you probably aren't good. The problem with games of this type if everyone thinks they're super 1337 pro when they're, in fact, terrible. Even pro streams of LoL are rarely impressive compared to HoN streams but that's another story.
1) As someone said earlier, have around 2-3 champions that you are insanely god-mode with. I mean get so good at these champions that even if you lose you have multiple early game kills and 100+ cs at 15 minutes or whatever. For me, these champions are Nidalee and Irelia.
2) If you're one of the higher elo players at champion selection, try to get one of these champions for yourself but MAKE SURE it fits within the rest of the team. Your teammates may not give a **** about that, but it is your job to care. For instance, many games I want to play Nidalee but if my teammates already picked 0 cc champions then picking Nidalee would be a sure loss. If the other team has a Malzahar or champions that can shut down my lane pushing easily with a gank, I don't pick Nidalee. This is probably the most important part of champion selection. And yes, playing a tanky dps carry (like Irelia) is a good idea if you are good b/c for some reason everyone in this game wants to pick ap mages or ad carries and feed with them. Also, saying "I ALWAYS win my lane!1" is ignorance b/c some champions just beat yours and sometimes you will be vs them. It is your job to know that unless that player is terrible you can lose your lane and ask for 1 or 2 early game ganks from your jungler.
3) Try to play the style that fits your champion but not if your team cannot be trusted to understand it. What I mean is everyone seems to want to play Rain Man Teemo these days and sit in top lane all game pushing while their team feeds then tell them how horrible they are. At low elo, you cannot trust your team to split push or gank and have the discretion to avoid poor positioned team fights, etc. Therefore, you can no longer be super Rain Man Teemo. It is now time for you to go be "help your team win" teemo. Many players lose tons of games trying a strategy that works for the pros but won't work with your teammates/elo. When I play Nidalee my absolute favorite thing to do is push (or "backdoor" as people in this game call it, even though it's not backdooring at all) towers solo while my team threatens other lanes or controls dragon/baron. However, I can tell pretty early if my team is even capable of that and if not, I play Nidalee as a support healer/poker and ward everywhere to get good ganks.
4) Try to dominate your lane and early low-numbers team fights then lead your team. I have found that if you try to lead your team at 0-2 because you got stuck laning with downie lux that pushes your lane and tower dives then your team will simply go into troll mode and start telling you how awful you are. However, when you are 6-0 Ashe with 150 cs in 15 minutes and just got a triple kill, people suddenly believe you are Hotshotgg on a Smurf account and will follow you to their deaths. Use this. Show your team that you are decent then lead them in the mid/late-game phases so they don't feed or overextend, etc.
5) This goes back to playing champions you are good with, but play champions that you can REALLY farm with. Then use that extra cash to place wards occasionally. No one wants to buy wards when they are playing carries but guess what? You are in elo hell and most likely everyone is playing carries. Therefore, you should get so much cs that you can buy your 2-3 core items and STILL buy wards every time you back. This is invaluable to your team and your personal success level in early laning phase.
6) In reference to your problem where you can ignore people but still be placed in teams with them, my strategy is to ignore them, get up and take a 5 minute break to get a drink or smoke or cool down however it is that you cool down, then go queue up again. This way, you will certainly not be placed on a team with them. It is incredible how many feeding terribads will rage at you while you're in chat for 10 minutes, but the moment you leave the game and requeue they do the exact same thing so they can follow you around and troll you for another loss.
There are tons more tips I could give you, but there just is no magical remedy. I was 1800+ in HoN and so far have only reached ~1550 in LoL. I just went on like a 6 game losing streak with teammates that say "gg game's over" when a lane dies once and loses tower then sits in fountain to ensure your loss. Things like this you simply can't overcome so do your best to minimize these games by having an overall positive attitude and do your best to carry.
Sorry for length.