You can be different in this game and do good, but the community dogmatically defends the meta that they'll trash talk anyone who doesn't follow it. They won't say anything if you are doing good, but do bad once and they'll gang up on you. I use an off-meta Sona build and was on a winning streak so I didn't notice it, but when I started losing games here and there, even the enemy team in all chat does not fail to tell you how bad you are on those losing games.
Basically, you can be off-meta all you want, but lose one game and the entire community will tell you how bad you are for using an off-meta build, and thinks they lost because you used an off-meta build, regardless of what your build's winrate actually is.
http://www.mobafire.com/league-of-legends/build/sona-the-solo-aggressive-support-an-in-depth-guide-486735
Coming up with an off-meta build is hard, since you have no reference and need to know the champion yourself. It means its probably easiest to do on your main. Its hard. You are stepping into unknown territory. If you are trying to come up with one with a goal in mind, ignore the people who berate you if you lose a game once. Focus instead on actual data, like winrate, to see if the build is viable or not, not what that random enemy said to insulted you.
Good luck to you, man.