Sorry about my English. This has happened to me so many games. When I picked an obvious mid toon like Cassiopeia with ignite and flash, then 5 seconds later a guy who hasn't pick anything just said "mid" then claimed that he deserved to be mid since I didn't call for it. I don't know if I should be calling first. Calling > picking does make sense in rank, but in normal really ? ( I always just pick, not insta lock though).

The only obvious picks are supports and junglers (smite). In blind normals, potentially anything goes and making any assumptions is probably a really bad idea.

So, if you're picking top, adc bot or mid, those are the roles you should call out as a courtesy to avoid confusion. That said, you're going to have the occasional instant lock-in 4 adc games... which you can either dodge or play and hope for the best.

It's not "confusion" it's people not paying attention to what has been picked before calling their lane/role.

I kinda feel iffy about it. I'll generally call as I pick, and if someone grabs the same at either the same time or slightly after I will mention what other roles I am willing to play. If I'm not really interested in playing any other role I will state that and we can either go with a suboptimal setup or whatever, they are blind normals it isn't that critical in my mind.

If you really want to try something crazy, you can start picking later so that way all the insta-lock children can get their role/position, and then you can fill in what's left.

Although most players agrees with the current meta and play alone with it.
(Top bruiser, Mid apc, Bottom adc+support, and one jungler)

But there are some players, especially the new players, don't want to play alone with the current meta.
To avoid such conflict, I suggest to call out the position you want to be as early as possible. At least that is what I always do.

To be honest, atleast half the population here in normals is honestly, retarded. Don't expect much more at all

Oh man. That chaps my hide. The other day I was at team select. Someone picked Lee Sin and called bot. Well, then someone picked an ADC. All roles except support were files, so I picked Taric. At this point it's obvious that Lee goes top, but he refused and insisted that I go top... I left the game 30s in.

I do that all the time. I will sit in the furthest bush as long as I have river and tri warded. I'll make sure the ADC knows I'm there and I can often zone them, allowing my carry to farm freely.