Ok. Here is the thing you need to decide. Do you want the truth, or do you want to hear something that makes it ok for you to continue to do what you want to do?
The truth is....(Skip to the section 2 if you don't want to hear it)
Section 1
There is a right way and wrong way to play this game period.
The game is a series of mathematical equations.
People who play this game for a living (or moire likely the companies that pay them) have figured out the absolute most efficient way to do literally everything. They have tried every combination of build. They have tried every team comp. They have tried anything you can possibly think of and discovered the absolute BEST way to do it. This is basically what creates the "meta"
What this means is that if you and I both have a similar skill set and we both play the same champs. If I build their way and you dont I will win.
That being said, when you que a ranked match you should in theory intend to give it your very best effort to win.
If you build something that is "outside the box" or "non meta" say for instance, AD Sona, you are intentionally doing something that hurts your teams chance of winning. I say intentionally because if you understand my previous statement, the very best way to do things has already been figured out, you are choosing to play at a disadvantage.
Think of at like a track star that decided to wear shoes that were 10X heavier than normal track shoes just because he liked them or thought they looked cool. Even if he won a race occasionally it doesn't make the heavy shoes a good option. He would perform much better with lighter shoes. That can't be argued. The result doesn't change that simple fact. Now apply that to league. If you are doing things that are "non meta" or "outside the box" you are hurting your teams chances of winning. Now if you are playing normals that isn't a problem....thats exactly what normals are for. But when you que ranked you are making a pact with 4 other real people to try your best to win as a team. If you build AD Sona (just an example) you are hurting the teams chances and of course they are going to be mad.
Section 2
Don't listen to other people.
Play whatever you want however you want and just mute everyone.
You know what's best for you and your play style.
You are an innovator and everyone else just hasn't caught up to your brilliance yet.
Games are for fun and as long as YOU are having fun no one else matters.